A laser used in eye surgery to fuse detached retinas produces radiation with a wavelength of 6.4 x 10^-7 m. What is the frequency of the laser?
Speed of light = 3.00 x 10^8 m/s
(Hint: Remember to round your answer to the lowest number of significant figures.)
(Speed of light) / (Wavelength) = Frequency
show steps please.
Answer:
ν ≈ 4.7 × 10¹⁴ Hz
General Formulas and Concepts:
Chem
Speed of Light = Wavelength times Frequency
c = λν c = 3.0 × 10⁸ m/sExplanation:
Step 1: Define
λ = 6.4 × 10⁻⁷ m
Step 2: Solve for ν
3.0 × 10⁸ = 6.4 × 10⁻⁷ · ν
ν = 4.6875 × 10¹⁴ Hz
Step 3: Check
We are given 2 sig figs. Follow sig fig rules.
4.6875 × 10¹⁴ Hz ≈ 4.7 × 10¹⁴ Hz
The element with the smallest iconic radius in the alkaline earth metals is
Answer:
Metal.
Explanation:
Metal has the smallest iconic radius in the alkaline earth metal.
A 7.0 liter balloon at room temperature contains helium gas. if the temperature is halved, what happen to the volume?
The volume = 6.71 L
Further explanationCharles's Law
When the gas pressure is kept constant, the gas volume is proportional to the temperature
[tex]\tt \dfrac{V_1}{T_1}=\dfrac{V_2}{T_2}[/tex]
V₁=7 L
T₁=25 °C(room temperature) + 273 = 298 K
T₂=12.5(halved) + 273 = 285.5 K
[tex]\tt \dfrac{V_1}{T_1}=\dfrac{V_2}{T_2}\\\\\dfrac{7}{298}=\dfrac{V_2}{285.5}\\\\V_2=6.71~L[/tex]
CAN U GUYS HELP ME ON THIS ONE PLEAASE IM TOO DUMB YO ANSWER THIS ONE IM NOT EVEN LYING TOO PLUS THIS ASSIGNMENT WAS DUE LAST FRIDAY :(
CH3Br Draw out the work for all 4 steps for the Lewis structure.
Grading Criteria:
a. Correctly count the total valence electrons (2pt)
b. Correctly identify and draw the location of the central atom and surrounding atoms. (2pt)
c. Correctly draw the total amount and location of the electrons on the lewis structure. (2pt)
Answer:
For CH3Br, there are a total of 14 valence electrons. Hydrogen always goes on the outside, and since Carbon is less electronegative than Bromine, we'll put the Carbon in the center and the Bromine on top. We have 14 valence electrons for the CH3Br Lewis structure. Put two between atoms to form chemical bonds.
Explanation:
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Write the chemical formula for the covalent compounds below
EXAMPLE- dinitrogen trioxide= N2O3
nitrogen monoxide =
dihydrogen oxide =
diphosphorus pentoxide =
sulfur trioxide =
Answer:
down below
Explanation:
NO
H20
P4O10
SO3
1. NO
2. H2O
3. P4O10
4. SO3
The lowest allowable energy state of an atom is called its .
Electromagnetic waves will travel the SAME SPEED (speed of light) WITHIN a medium as it does WITHOUT a medium. Question options: True False
Answer:
True
Explanation:
The speed that electromagnetic waves will travel within any medium is the same as those without a medium. The speed of electromagnetic wave is a constant and does not depend on the material of the medium.
Electromagnetic waves are waves that do not require a material medium for their propagation. They are able to pass through vacuums and mediums with particles at constant speed. It is mechanical waves whose speed is medium dependent. Mechanical waves have varying speed based on the mediums they move through.Describe what happens to kinetic energy of the molecules when temperature increases.
Answer:
When the temperature of an object increases, the average kinetic energy of its particles increases. When the average kinetic energy of its particles increases, the object's thermal energy increases. Therefore, the thermal energy of an object increases as its temperature increases.
Explanation:
That is all I know.
Match each form of energy with its correct description.
mechanical
involving the motion of atoms
chemical
involving electrical charges
thermal
involving the position and motion of
an object
electrical
involving energy stored in chemical
bonds
Answer
involving electrical charges: electrical
involving energy stored in chemical
bonds: thermal
involving the position and motion of
an object: mechanical
involving the motion of atoms: chemical
Explanation:
almost 100 this is right, sorry if this is wrong :)
Teresa creates an experiment Washington states to read colored substances together in a container in observes the solution slowly changing from red to blue for the next eight minutes. The solution becomes completely blue after 8 minutes. What does this represent about the type of change happening in the container
The question is incomplete, the complete question is;
Theresa creates an experiment where she mixes two red-colored substances together in a container and observes the solution slowly changing from red to blue for the next eight minutes. The solution becomes completely blue after eight minutes. What does this represent about the type of change happening in the container? A chemical change started immediately and finished at eight minutes. A non-chemical change started immediately and finished at eight minutes. A chemical change occurred at four minutes. A non-chemical change occurred at four minutes.
Answer:
A chemical change started immediately and finished at eight minutes.
Explanation:
A chemical change is one in which a new substance is formed. One of the indicators that a chemical change has occurred is the change in the color of the system from red to blue.
The question clearly stated that the change occurred gradually. This means that the reaction must have started immediately the substances were mixed and went on to conclusion after eight minutes when the complete blue color appears.
How do you identify an element?
Answer:
element is the smallest particles which cannot be broken down.
How can the gravitational potential energy of an object be changed?
Answer:
Gravitational potential energy may be converted to other forms of energy, such as kinetic energy. If we release the mass, gravitational force will do an amount of work equal to mgh on it, thereby increasing its kinetic energy by that same amount (by the work-energy theorem).
Explanation:
if one species of rabbit, the gene for brown fur ( B) is dominant, while the gene for black fur ( b) is recessive. One rabbit has the dominant allele for brown fur and the recessive allele for black fur. Another rabbit has two recessive alleles. If the two rabbits have offspring, what are the odds of one of the offspring having brown fur?
Answer:
1/2
Explanation:
According to this question, the gene coding for fur color in rabbits contains two alleles viz: alelle for brown fur ( B) is dominant, while the allele for black fur ( b) is recessive. This means that an heterozygous rabbit (Bb) will have brown fur.
Based on the question, one rabbit has the dominant allele for brown fur and the recessive allele for black fur i.e genotype Bb, another rabbit has two recessive alleles i.e. genotype bb. If these two rabbits cross i.e. Bb × bb, the proportion of the offsprings produces will have Bb, Bb, bb and bb genotype.
Bb is dominant, hence, 1/2 of the offsprings will be brown furred.
one species of rabbit, . the two rabbits have offspring, what are the
The table below contains characteristics of four different elements. Characteristics of Four Elements Element Number of Protons Number of Valence Electrons 1 ca 4 2. 11 1 1 3 18 8 4 37 1 1 What conclusion can be made from the information above? Element 3 is a metal and Element 1 is a metalloid. Element 2 is the same element as Element 3. Element 1 has very similar chemical properties as Element 4. Element 2 has very similar chemical properties as Element 4.
Answer:
The correct option is "Element 2 has very similar chemical properties as Element 4"
Explanation:
Both element 2 and element 4 have the same number of valence electrons; meaning they will be found in the same group (group 1) of the periodic table. Elements in the same group of the periodic table exhibit similar chemical properties. For confirmation, element 2 is sodium (based on the atomic number of 11 provided) while element 4 is rubidium (based on the atomic number of 37 provided) - the two elements are found in group 1 of the periodic table.
NOTE: Number of protons is the same as atomic number
395,000 divide by 9000
Answer:
it is 395/9 =43.8888889
help !!!!!!! cell membrane plants information due soon
check wether all the answers are correct or not. please?
Answer:
I dont now but I think it is correct
CAN SOMEONE PLEASE HELP ME WITH THIS PLZ
Answer:
the pressure increases
If nitrogen and hydrogen combine in a combustion reaction, what would the product of the reaction be?
CH4 + 2O2 → ____2 + 2H2O
Co2
Explanation:
CH4 (g) + 2 O2 (g) → CO2 (g) + 2 H2O (l)
Answer:
C - CO
Explanation:
Correct on EDGE
In a solution, what term is given to the liquid?
Answer: solvent
solvent is A solvent is usually a liquid
Answer: Solvent
Explanation: Everything that dissolves in water and the things which dissolve are called solutes and the liquid in which they dissolve in is called a solvent to form a solution.
The chemical equation shows only the reactants and one product. How many H atoms must be present in the second product that is formed?
Answer: In chemical equations, the number of atoms of each element in the reactants must be the same as the number of atoms of each element in the products. If we count the number of hydrogen atoms in the reactants and products, we find two hydrogen atoms.
You are at a carnival fun house standing 3m in front of a lens with a focal length of 2.5m. What would happen to your image if the lens was concave? What would the image look like if the lens was convex?
Select the correct answer. Which substance is made of polymers? A. marble B. protein C. salt D. steel
Answer:
the answer is B proteins
Explanation:
brainliest pls
Answer:
B. protein
Explanation:
A polymer is defined as a molecule which has 'n' number of monomer units.
Similarly proteins are also polymers as they are made up of amino acids and contain a number of repeated units just like polymers.
what is the chem formula for chromium (V) chloride?
Which of the following would most likely cause a chemical reaction to occur at a slower rate?
Answer:
D
Explanation: When you chill a substance when it is mixed with another substance, ( chilled vinegar mixed with sodium bicarbonate will react slower for instance) it reacts slower do to the molecules slowing down when chilled.
[tex]\huge\boxed{Option D}[/tex]
Solution:a liquid mixture in which the the solute which is in a smaller proportion is uniformly distributed within the the solvent which is the major component is called a solution.
_____________________________________Option AStirring the substance together vigorously:It increases the rate of reaction, because when we stir the solute in the solution, the mixed solute particles are distributed more further than when they are left stationary, making the environment (which surrounds the solute) less concentrated by the dissolved solute thus the rate increases and more solute is mixed.
Option BDissolving the reacting substance in water:No, A reacting substances in water are those which can react with water that are Ionic metal. Water is made of ions [tex]H^+ and OH^-[/tex]. Substances(solute), they mix or dissolve more because Solutes ions interact with the ions of a water(solvent), thus breaking the bonds between the solute and then ions of solute form bond with the ions of water. Thus the rate increases in water.
Option CIncreasing the temperature increases the rate of reaction:No, because by the increase in temperature, the kinetic energy of more molecules of a substance increase which results in reaching the threshold energy(minimum energy required by the molecules to change into product) of more molecules. So less molecules are left with low energy.
Option DDecreasing the temperature decrease the rate of reaction.Yes, the rate of reaction decreases because the molecules are slower and collide less. Less molecules make the effective collisions due to which the kinetic energy of molecules is less, so less molecules make up to the threshold energy. So decrease in temperature lowers the rate of the reaction.
_____________________________________Best Regards,'Borz'We apply the same amount of energy to 10.0-g samples of aluminum, iron, and silver which begin at the same temperature. Rank the metals from highest to lowest temperature after the heat is applied
Answer:
Ag > Fe > Al
Explanation:
The values of the specific heat capacity of the elements are given as;
Aluminum = 0.897 J/g*K
Iron=0.449 J/g*K
Silver=0.235 J/g*K
Specific heat capacity basically refers to how much heat is required to change the temperature of a unit mass of a substance by a degree. Elements with high specific heat capacity would require higher energy compared to elements with lower values,
Aluminium (Al) has the highest specific heat capacity, hence it wold require more energy to cause a change in temperature. Aluminium would be the lowest.
Silver (Ag) has the lowest specific heat capacity hence it would require less energy to cause a change in temperature. Silver wold be the highest.
The middle would be iron (Fe).
The rank is given as;
Ag > Fe > Al
A sealed can of soda contain a pressure of 1.15 atm at 23°C. What is the new pressure at 79 °C? Report your answer to the hundredths place (two decimal places) You do NOT need units in your answer
Answer:
P₂ = 1.37
Explanation:
Given data:
Initial pressure = 1.15 atm
Initial temperature = 23°C (23+273= 296 K)
Final pressure = ?
Final temperature = 79°C (79+273=352 K)
Solution:
According to Gay-Lussac Law,
The pressure of given amount of a gas is directly proportional to its temperature at constant volume and number of moles.
Mathematical relationship:
P₁/T₁ = P₂/T₂
Now we will put the values in formula:
1.15 atm / 296 K = P₂/352 K
P₂ = 1.15 atm × 352 K / 296 K
P₂ = 404.8 atm. K /296 K
P₂ = 1.37 atm
Need help please with this, I’ll give brainliest!!!
Answer:
38 g?
Explanation:
I'm not entirely sure, but perhaps it is 49 grams x 78.25%? This gives you an answer of 38 g using significant figures.
Volume of water displaced
Answer:
The volume of displaced fluid is equivalent to the volume of an object fully immersed in a fluid.