Marie Curie formulated the hypothesis that there exists a radioactive element distinct from uranium and barium, and she tested its implications. Her method was first applied to pitchblende, a substance that includes uranium and gives off high amounts of radioactivity. Curie isolated a white powder from the pitchblende that was 900 times more radioactive than pure uranium. But because the powder contained barium, an element that also produces radiation, the findings were not yet conclusive. Curie resorted to spectrographic analysis, which indicated that the substance was not barium. The evidence produced by all of these tests established the existence of another radioactive element that came to be known as radium. Which of the following statements properly describe the discovery of radium?
A. Because barium and uranium were the only elements known to give off radiation and yet, in this case, they had to be eliminated as the source of an excess radiation, internal coherence required the hypothesis of an as yet unknown radioactive element.
B. Curie's spectrographic studies contradict the belief that she had discovered a substance that was neither uranium nor barium.
C. Spectrographic studies supported the coherence of the radium hypothesis.
D. The internal coherence of the hypothesis that established the existence of radium was achieved in part by the elimination of other known elements that cause radiation.

Answers

Answer 1

Answer: i want points

Explanation:


Related Questions

If you wanted to find out the average temperature in Africa, what kind of map would you use?

Answers

Answer: Basically it depends on the elevation:

The field of geography relies on many different types of maps in order to study the features of the earth. Some maps are so common that a child would recognize them, while others are used only by professionals in specialized fields. Some of the most common types are political, physical, topographic, climate, economic, and thematic maps.

Types of Maps

Simply defined, maps are pictures of the Earth's surface. General reference maps document landforms, national boundaries, bodies of water, the locations of cities and so on.

Thematic maps display specific data, such as the average rainfall distribution for an area or the distribution of a certain disease throughout a county.

Political Maps

A political map does not show topographic features like mountains. It focuses solely on the state and national boundaries of a place. These maps also include the locations of cities large and small, depending on the detail of the maps.

A typical example of a political map would be one showing the 50 U.S. states and their borders along with the United States' international borders.

Physical Maps

A physical map is one that documents landscape features of a place. These maps generally show things like mountains, rivers, and lakes. Bodies of water are commonly shown in blue. Mountains and elevation changes are sometimes shown with different colors and shades to show elevation. On physical maps, greens usually indicate lower elevations while browns usually indicate higher elevations.

This map of Hawaii is a physical map. Low elevation coastal regions are shown in dark green, while the higher elevations transition from orange to dark brown. Rivers are shown in blue.

World Map 3D Render Topographic Map

World Map 3D Render Topographic Map. FrankRamspot/Getty Images

Topographic Maps

A topographic map is similar to a physical map in that it shows different physical landscape features. Unlike physical maps, though, this type of map uses contour lines instead of colors to show changes in the landscape. Contour lines on topographic maps are normally spaced at regular intervals to show elevation changes (e.g. each line represents a 100-foot elevation change). When lines are close together, it means the terrain is steep.

Climate Maps

A climate map shows information about the climate of an area. These maps can show things like the specific climatic zones of an area based on the temperature, the amount of snow an area receives, or the average number of cloudy days. These maps normally use colors to show different climatic areas.

This climate map for Australia uses colors to show differences between the temperate area of Victoria and the desert region in the center of the continent.

Vegetation zones of the world, lithograph, published in 1897

Vegetation zones of the world, lithograph, published in 1897.  ZU_09/Getty Images

Economic or Resource Maps

An economic or resource map shows the specific types of economic activity or natural resources present in an area through the use of different symbols or colors depending on what is being depicted.

This economic activity map for Brazil, for example, uses colors to show different agricultural products of given areas, letters for natural resources, and symbols for different industries.

Road Maps

A road map is one of the most widely used map types. These maps show major and minor highways and roads (depending on the degree of detail), as well as things like airports, cities, and points of interest such as parks, campgrounds, and monuments. Major highways on a roadmap are generally shown with thick, red lines, while minor roads are lighter in color and drawn with narrower lines.

A road map of California, for example, would depict Interstate highways with a wide red or yellow line, while state highways would be shown in a narrower line in the same color. Depending on the level of detail, the map may also show county roads, major city arteries, and rural routes. These would be depicted in shades of gray or white.

Thematic Maps

A thematic map is a map that focuses on a particular theme or special topic. These maps are different from the six aforementioned general reference maps because they do not just show features like rivers, cities, political subdivisions, elevation, and highways. If these items appear on a thematic map, they are background information and are used as reference points to enhance the map's theme.

This Canadian map, for example, which shows changes in population between 2011 and 2016, is a good example of a thematic map. The city of Vancouver is broken down into regions based on the Canadian Census. Changes in the population are represented by a range of colors ranging from green (growth) to red (loss) based on the degree of change.

Why have women been oppressed throughout history?

Answers

Explanation:

I think this is the answer

How does a councillor Undertake
development of
an area? ?​

Answers

Answer:Councillors are elected to the local council to represent their local community, so they must either live or work in the area. ... representing the ward for which they are elected; decision-making; developing and reviewing council policy ... These meetings, and any visits to council offices, may need to take place during the ...

Explanation:

How has population growth affected the region select all that apply.

Answers

Answer:

Increased population will invariably affects the biodiversity of a region because more food and other raw material will be source thereby altering the well being of other species in the ecosystem that depend on the raw material. Example the population explosion of human has bring about increase in fuel consumption.

Explanation:

If you were the President of the USA, who would you nominate for the Supreme Court and why? *please give detailed answer*

Answers

Answer:

Most efficient and judicious.

Explanation:

If you were the President of the USA, I would nominate the most efficient and judicious judge for the Supreme Court because this type of judge will ensure the rule of justice in the country. He will made fair decisions and will not tolerate injustice done by any person. Good judges are the needs of every country because they implement the rule of law in the country so I will choose the most efficient, judicious and well reputed judge for the supreme court.

What is international political economy? With Authors

Answers

Answer:

International economic policy is a social science whose objective is to study the way in which the different political bodies at the international level, especially governments, regulate through their actions the economy of the territory they administer and, therefore, the economic life of the countries. citizens who live there.

Thus, international economic policy analyzes the international economic relations between the different countries, the internal and external economic measures of each nation, the international free trade agreements, etc.

The Supreme Court is best characterized as
a federal court.
an appellate court.
a judicial court.
a inferior court.

Answers

The correct answer is B. An appellate court.

Explanation

The Supreme Court of the United States is the highest judicial court in that country. This entity is made up of a president and eight associate judges who are chosen by the president and subsequently validated by the Senate.

Among the functions of the Supreme Court are judicial review and the power to declare unconstitutional federal or state laws and acts of the federal and state executive powers. Likewise, decisions made by the Supreme Court cannot be appealed.

On many occasions, the Supreme Court has the function of being an appeals court because it resolves appeals made against decisions made in district courts and other cases of federal courts. Therefore, the correct answer is B. An appellate court.

Answer: an appellate court

source: trust me bro

What US medical agency recently revised its guidance on cleaning surfaces with disinfectant

Answers

Answer:

CDC

Explanation:

During the period of the Crusades, warfare between Christians and Muslims lasted nearly:

Answers

Answer:During the period of the Crusades, warfare between Christians and Muslims lasted nearly 200 years. ... The Crusades, with the initial specific objective of restoring Catholic control over the Holy Land, were fought over a period of almost two hundred years, between 1096 and 1291.

Explanation:

In the early days of the country, presidential campaigns were conducted within a significantly shorter period of time. Today, it is common for potential presidential candidates to start campaigning shortly after the congressional midterms end, making the presidential campaign season a regular fixture in American political life. Develop an argument that explores whether longer presidential campaign seasons are helpful or harmful to American democracy.

Answers

Answer:

Long campaign is good for democracy

Explanation:

While a shortened campaign might save resources as well as energy but instead will likely alleviate voter alienation, our lengthy election system is beneficial to both voters and governance.

Most importantly, a long campaign allows us to take our time to absorb all of the facts about the representatives until voting. Numerous studies indicate that we are quick to respond to the language, speech, as well as facial gestures of others.

Answer:  There is lot of debate around the positive and negative outcomes of Longer Presidential Campaign seasons. We need to go through both of it to understand more effectively.

Harmful effects of Long  Presidential Campaign:

Provide Less time for Governance: A presidential term is 48 months, the political media is transfixed by campaign coverage for 18 months,  every cycle means that a President can wield power with substantially reduced media attention for more than 1/3 of his term.Bolstering orthodoxies and narrowing the range of permitted views.Harmful for economy: While a shorter campaign would save money and time, and would probably reduce voter fatigue.It intensifies division: Among ordinary Americans who have far more in common than differences, the long campaign effects them psychologically, and creates division.

Positive Effects:

Help in Democratic Awareness, a lengthy campaign forces us to slow down and fully process information about the candidates before voting. Abundant research shows that we tend to react instantly to others’ words, speech and facial expressions.    Generates better candidates: A long campaign also give Candidates exposure to Politics, filtering out those who are not ready for prime time. It reduces the sense of inevitability: A drawn-out campaign is also better for democracy because it reduces the sense of inevitability that can prevail in shorter elections. While weeding out those who can’t handle the prolonged spotlight, longer campaigns also give underdogs a chance to prove themselves and establish name recognition.

So, as per the above arguments long campaigns could have some important positive results like better communication between Leader and Citizen, and better use of democratic rights. But it also have some lethal drawbacks like divison, and effects on governance.

Learn More: https://brainly.com/question/19454642

This particular circus is about to shut down for two-and-a-half years. If only we could pack it into fewer months next time.

My son is watching TV. I tell him to clean up his room. He grunts. 10 minutes later I tell him to clean up his room. He says "yea, ok" 10 more minutes later I tell him to clean up his room. He says "I'm going, I'm going" 10 more minutes and he is still watching TV. I say "CLEAN UP YOUR ROOM!" "ALRIGHT" he says and goes to clean up his room. This is the Mom Theory of what? Multiple Choice

Answers

Answer:

the mom therory of superiority

Explanation:

early growth theorists assumed that which characteristic was typical of labor markets

Answers

Answer:Early growth theorists assumed the flexible wages, which is determined by the forces of demand for and supply of labour. Horizontal demand curve indicates perfect elasticity of demand

Explanation:

Imagine you are a principal at an inner-city high school. Many of the students come from families where at least one parent had a negative influence on their childhood and they have formed a gang that promotes violence in the school. Which theory of deviance would you apply to this situation and how would you apply it

Answers

Answer: structural functionalism theory of deviance

Explanation:

The theory of deviance that would be applied in this situation is the structural functionalism theory of deviance.

The structural functionalist, theory of deviance explains that there should be a principle about how the individuals in a society should behave.

In such case, those that don't follow the acceptable behavior or norms in the society are punished.

PSYCHOLOGY:
Define what the out-group homogeneity effect is, and then give an example of it.

Answers

Answer:

Outgroup homogeneity is the tendency for members of a group to see themselves as more diverse and heterogeneous than they are seen by an outgroup. Thus, for example, whereas Italians see themselves as quite diverse and different from one another, Americans view Italians as more similar to each other, or more alike.

Which of these decision-making steps is likely the most time-consuming?


Identify the decision to be made.

Select the best plan.

Gather information and data.

Develop a plan of action.

Answers

Answer:

gather information and data

Explanation:

gather information and data

If someone says they have a "CAPITAL", this means that
that person mainly has something that represents

Answers

Answer:

Future money

Explanation:

In the triangular trade, which goods did traders in the Americas exchange for enslaved Africans?
A. Cloth
B. Guns
C. Cotton and Tobacco
D. Glass Beads

Answers

im pretty certain that is cotton and tobacco, i think this is what i was just learning about

Answer:

tobacco and cotton

Explanation:

k12

If you are often absent from work, you are reducing _____.


your vacation time

your insurance benefits

your work load

your value as an employee

Answers

Answer:

your value as an employee

i would say your value as an employee because the more you miss work the more your boss sees you as less valuable to the position, they won’t depend on you and such and you could possibly get fired

Which of these processes always causes a physical change of the shepe of a material

Answers

Answer:

Cause grinding can change the shape of any object. While heating may melt some things it won't melt all.

Which speaker reveals the most bias towards the issue?​

Answers

Answer:

D is the answer

Explanation:

I hope this helps, and thanks! I think this is the answer, but I may be wrong. BRAINLIEST PLEASE!

Answer:

speaker A

Explanation:

its doesn't match the rest

army of youth and students in support on Zedong


A. Bolsheviks

B. Black Hand

C. Green Revolutionists

D. Red Guard

Answers

Answer:

ᖇᗴᗪ ᘜᑌᗩᖇᗪ

=> ᗩᖇᗰY Oᖴ YOᑌTᕼ ᗩᑎᗪ ՏTᑌᗪᗴᑎTՏ Iᑎ ՏᑌᑭᑭOᖇT Oᖴ ᘔᗴᗪOᑎᘜ ᗯᗩՏ Tᕼᗴ ʳᵉᵈ ᵍᵘᵃʳᵈ.

1
2
3
4
5
6
7
8
9
10
When measuring wellness, you must consider
A. all components of health
B. your physical fitness being in the top 10% of the population
C. being free of diseases
D. both physical and mental health
Please select the best answer from the choices provided.
A
o
B

Answers

The answer is A. I had that same question

What should be asked when deconstructing a commercial made in the
1950s?
A. Who was the commercial made for?
B. What points of view are left out?
C. Who paid for the commercial?
O O
D. All of the above

Answers

D Sorry If I am Not correct

This image shows precession. Describe what precession is in relation to Earth.

Answers

Answer:

What image...

Explanation:

After the Japanese bombed Pearl Harbor, many Japanese Americans were
a-held prisoner in internment camps.
b-shipped off to Japan.
c-forced to work in airplane factories.
d-welcomed into the White House by President Roosevelt.

Answers

Answer: a-held prisoner in internment camps.

Describe changes in education/learning that have impacted you positively and/or negatively during the pandemic

Answers

Answer:

One change that education and learning have positively impacted me is that I have improved in my typing skills and I'm better used to technology. It has also negatively impacted me by decreasing my social skills because we are in-home.

If you do online school:During the pandemic my education has gotten harder due to the switch of having to be online it’s more harder to get motivation and has put me in a rough place
If you do in person school; during this pandemic my education has gone harder due to social distancing , It has been no fun social distancing because I’m not able to get the full experience of learning.


Positives for online school: what affected me positively during the pandemic is online school gives me a chance to work around the clock giving me time to work on my mental health and be the best me

Positives for in person school: The pandemic has positively impacted my Learning because it’s giving me a chanceTo start motivating myself more because the pandemic is deadly and I’m lucky to be here learning in school

Rome is how many
miles away from the Mediterranean Sea?

Answers

Answer:

590 miles

Explanation:

Answer:

590 Miles

Explanation:

what recommendations can the community make on the issue of human rights violations​

Answers

Answer:

Explanation:

Conclusion: Regard for and usage of human rights gives the premise to tranquil and amicable concurrence among people groups with various social and religious foundations. This decent variety of societies and religions improves the all-inclusive importance of human rights at the national and provincial dimensions.

Before Jonas Salk discovered a vaccine to prevent polio, people noticed a correlation between outside temperature and the incidence of polio: The warmer the temperature over the course of the year, the more outbreaks of polio. This relationship is an example of a(n) ________ correlation.
a. negative
b. positive
c. spurious
d. illusory

Answers

Answer:

Positive

Explanation:

Correlation

This term is used to describe the measure of how strongly two or more variables are close of related to each other. It has a null , one-tailed and Alternative Hypothesis.

Positive Correlation:

This simply implies that means that an high values of one variable are linked with high values of the another or based on your preference, the variables increase together.

The Strengths of correlation is a method to showing possible relationships between variables and othertime are the only practical or ethical way of carrying out an investigation..

The Weaknesses of correlation is that correlationall analysis do not show or demonstrate a cause and effect relationship that exists between variables understudy.

The Compromise of 1850 outlawed the slave trade in
A. Missouri
B. Washington, D.C.
C. New Mexico
D. Utah
SUBMIT

Answers

I think it’s B.

Hope this helped!!!

Answer:

B) Washington, D.C.

Explanation:

Other Questions
i need help! i provided the problem in the picture In a class test, +4 marks were awarded for the correct answers and -1 mark for the wrong answers. Student scores 40 marks. If his correct answers were 11, find his wrong answers. * PLS TELL ME WHAT IT IS Mario shot 30 baskets in 6 minutes. Chris shot 48 baskets in 8 minutes. How many more baskets did Chris shoot per minute? A particle oscillates in simple harmonic motion, with amplitude A and period T. The particle starts from position x = A. What is the magnitude of the particle's displacement a time 3T/2?A. 3AB. 6AC. 2AD. 0 If a new bill is introduced to the House and eventually is approved by the House, it next goes to the ___. no link need right answer10 points Reem is 5 years older (bigger) than 3 times Sara's age. If Reem is 28 years old, how old is Sara? How do you know the surface water is not there because the sediment is saturated 7. "In A Long Walk to Water", Salva is able to survive the harsh environment of Sudan because of the kindnessof strangers. Which detail best supports the claim stated above?a. You must be hungry,' she said at last.b. "She nodded at him. She was old, much older than Salva's mother."C 'A few moments later, she came back out and gave him two handfuls of raw peanuts."d. "He chewed every nut into a paste before he swallowed, trying to make each one last as long as he could"8. Topic Sentence: My cat is afraid of everything. Select the supporting detail that doesn't fit.a. He hides under the couch when you turn the microwave on.b. He sleeps all day long.c. He runs away when you sweep the floor.d. He jumps every time the doorbell rings.9. Dora the Explorer is an educational show for kids. Which supporting detail best supports this topic sentence?a. She has a really cute monkey named Boots c. Dora's purple backpack holds all of her toolsb. Dora helps teach kids Spanish words,d. She usually stops Swiper from swiping10. It takes a lot of hard work to become a professional athlete. Which supporting detail best supports this topicsentence?a Professional athletes spend hours of practicing their sports c. All of us can be professional athletesb. People like professional football players make a lot of money.d. The pros live the good life.11. Which sentence is a supporting detail that recycling is important?a. There are many landfills available for waste. C. Recycling paper saves trees from being cut downb. Clean jars before recycling them.d. Separate your paper, cans, and glass jars before recycling12. Which sentence is a supporting detail that you should get enough sleep?a. Many people sleep later on the weekends.c. Caffeine keeps some people awake at night.b. Dark rooms are best for sleepingd. 7-9 hours' sleep keeps you refreshed the next day13. The Statue of Liberty is visited by thousands of people every year. The Statue of Liberty is a 151 foot tallstatue of a woman holding a book and a torch. It was a gift of friendship from the people of France. It hasbecome the universal symbol for freedom. Which of the following is NOT a supporting detail?a The Statue of Liberty is an amazing statuec. Many people visit the Statues of Liberty each yearb. The Statue of Liberty is 151 feet talld. It was a gift of friendship from France14. The peregrine falcon is a beautiful wild bird. It is also one of the fastest. In 1978, the peregrine falcon wasplaced on the endangered species list. The main reason the peregrine falcon was dying out was the use ofpesticides. Which of the following is NOT a supporting detail?a. The peregrine falcon is one of the fastest wild birds c. It was placed on the endangered species listb. It was dying out because of pesticidesd. The peregrine falcon is an amazing bird15. Danger often appears in the most unexpected places. People usually think of the bathtub as a safe, quietplace. But more accidents occur there than anywhere else in the home. Slips or falls that occur while enteringand leaving the tub injure thousands of people every year. Most people think of a baker as having a safe andpleasant job; however, rolling, kneading, and pounding dough causes clouds of flour dust, which can enter thelungs and disable the baker. Which of the following is NOT a supporting detail?a. Some activities are more dangerous than they look.b. Thousands of people are hurt in tub accidents every yearc. People think bakers have a safe job.d. Bakers can be disabled by flour in their lungs.please help me with this. Bluestone Company had three intangible assets at the end of the current year:a. A patent purchased this year from Miller Co. on January 1 for a cash cost of $3,600. When purchased, the patent had an estimated life of 12 years. b. A trademark was registered with the federal government for $8,000. Management estimated that the trademark could be worth as much as $200,000 because it has an indefinite life. c. Computer licensing rights were purchased this year on January 1 for $90,000. The rights are expected to have a six-year useful life to the company.Required:a. Compute the acquisition cost of each intangible asset.b. Compute the amortization of each intangible for the current year ended December 31.c. Show how these assets and any related expenses should be reported on the balance sheet and income statement for the current year. Subtract. 82.6 - 27.9 Today, you will create your own poem. You may choose any poetic style that we discussed today. The topic must be about "All that glitters isn't gold, the best things in life are...possessions, values, etc. Think about the stories we've read in this unit, "The Necklace," "Civil Peace", and your own personal experiences.To make it great, ADD A TITLE & PICTURE Have fun and make it great! (PLEASE NO WEBSITES)How is the poem "On the Bus with Rosa Parks" different from the memoir My Story? Check all that apply.The poem describes a single scene; the memoir describes many scenes.The poem uses few words; the memoir uses many words.The poem has short lines and stanzas; the memoir is written in prose paragraphs.The poem places the bus ride in historical perspective; the memoir does not.The poem explains why Rosa Parks stayed seated; the memoir does not.The poem shows an outsiders point of view of Rosa Parks; the memoir does not.The poem compares Rosa Parkss gaze to a flame; the memoir does not. Help please its music need help asap Employees at a company are given 1,200 to spend on items for the office.They decide to buy a coffee machine and as many bean bags as possible.Bean bags cost 40 with an offer of "Buy at least 15 get 10% off the price."The coffee machine costs 280.How much will they have left over from the 1,200? The right rectangular prisms are similar.Which statements are correct? Check all that apply.3.2 ATThe angles in the smaller prism measure 90degrees.The perimeter of the rectangular bases changes bya factor of 2.The surface area changes by a factor of 8.The larger prism has twice the volume of thesmaller prism.The area of the rectangular bases changes by afactor of 4.1.6------10.4V0.82.2. What is the era when japan changed leadership and made a series of reforms to modernize and westernize A=144pi^2 ft. Find the radius Une cooprative vend un important lot dufs de trois tailles diffrentes.20 % des ufs sont petits, 50 % sont moyens et 30 % son gros.Les ufs sont de deux qualits : - extrafrais car pondus depuis moins de 9 jours ;- frais car pondus entre 10 et 28 jours plus tt.On a remarqu que : 80 % des petits ufs sont extrafrais ; 50 % des ufs moyens sont extrafrais ; 20 % des gros ufs sont extrafrais.Dans ce lot, on prlve un uf au hasard et on note sa taille puis sa qualit.On nomme respectivement P, M et G les vnements luf choisi est petit , luf choisi estmoyen ; luf choisi est gros et on appelle E lvnement luf choisi est extrafrais .1) Construire larbre de probabilit traduisant la situation.2) Quelle est la probabilit dobtenir : a. un petit uf extrafrais ? b. un petit uf frais ?3) Quelle est la probabilit de choisir un uf extrafrais ? Aide moi svp