Answer:The wavelength of a photon with energy 3.0 eV is 413.57 nm and it is for visible light. This wavelength is of ultraviolet light.
Explanation:
We are given –
Energy of photon is = 3 eVTo find the wavelength of photon we have to use the Planck Expression.
[tex]\qquad[/tex] [tex]\star\: \: \pink{\boxed{\frak{ E = hf}}}[/tex]
[tex]\qquad[/tex][tex] \bf \longrightarrow E = hf [/tex]
[tex]\qquad[/tex][tex] \sf \longrightarrow E = h \times \dfrac{c}{\lambda} \: \: \purple{\bigg(\because f = \dfrac{c}{\lambda}\bigg)}[/tex]
Where, E is the energy of photon and f is the frequency of photon & h's called Planck Constant.
[tex]\qquad[/tex][tex] \sf \longrightarrow h = 6.63\times 10^{-34} \:Js[/tex]
[tex]\qquad[/tex] Speed of light, c =[tex]\sf 3\times10^{8} \:m/s[/tex]
[tex]\qquad\qquad\quad\underline{\sf{Substituting \ Values \ :}}[/tex]
⠀⠀⠀━━━━━━━━━━━━━━━━━━━━━━━━━━
[tex]\qquad[/tex][tex] \bf \longrightarrow E = h \times \dfrac{c}{\lambda} [/tex]
[tex]\qquad[/tex][tex] \bf \longrightarrow \lambda = \dfrac{hc}{E}[/tex]
[tex]\qquad[/tex][tex] \sf \longrightarrow \lambda = \dfrac{ 6.63\times 10^{-34}\times 3\times 10^{8}}{ 3eV}[/tex]
[tex]\qquad[/tex][tex] \sf \longrightarrow \lambda = \dfrac{ 6.63\times 10^{-34}\times 3\times 10^{8}}{ 3 \times 1.6\times 10^{-19}}\: \:\purple{ \bigg(\because 1 eV= 1.6\times 10^{-19} J\bigg)}[/tex]
[tex]\qquad[/tex][tex] \sf \longrightarrow \lambda = \dfrac{ 6.63 \times \cancel{3}\times 10^{-34+8}}{\cancel{3}\times 1.6\times 10^{-19}}[/tex]
[tex]\qquad[/tex][tex] \sf \longrightarrow \lambda = \dfrac{ 6.63 \times 10^{-26}}{1.6\times 10^{-19}}[/tex]
[tex]\qquad[/tex][tex] \sf \longrightarrow \lambda = 4.144 \times 10^{-26+19}[/tex]
[tex]\qquad[/tex][tex] \sf \longrightarrow \lambda = 4.144 \times 10^{-7}[/tex]
[tex]\qquad[/tex][tex] \sf \longrightarrow \lambda = 4.144\times 10^{-7}\: m[/tex]
[tex]\qquad[/tex][tex] \sf \longrightarrow \lambda = 4.144 \times 10^{-7}\times 10^{9} \: nm\: \: \purple{\bigg(\because 1m = 10^9\: nm \bigg)}[/tex]
[tex]\qquad[/tex][tex] \sf \longrightarrow \lambda = 4.144 \times 10^{-7+9}\: nm[/tex]
[tex]\qquad[/tex][tex] \sf \longrightarrow \lambda = 4.144 \times 10^{2}\: nm[/tex]
[tex]\qquad[/tex][tex] \pink{\bf \longrightarrow \lambda = 414.4\: nm}[/tex]
Henceforth, wavelength will be 414.4nm.Naturally occurring Indium has two isotopes.
4.28
%
4.28
%
of the atoms are
Indium
−
113
Indium
-
113
(
113
In
113
In
) with a mass of
112.9
u
112.9
u
and
95.72
%
95.72
%
of the atoms are
Indium
−
115
Indium
-
115
(
115
In
115
In
) with a mass of
114.9
u
114.9
u
. Calculate the average atomic mass of Indium with the correct number of significant figures.
Answer:
Average Molar mass is 114.8u
Explanation:
» From the formula of average Relative Atomic Mass [ RAM ]
[tex]{ \rm{RAM = \sum \frac{(isotopic \: mass \times \%abundance)}{100} }} \\ [/tex]
» We have two isotopes of Indium,
Indium-113, mass » 112.9u, % » 4.28%Indium-115, mass » 114.9u, % » 95.72%[tex]{ \tt{RAM = \frac{ \blue{(112.9 \times 4.28)} + { \green{(114.9 \times 95.72)}}}{100} }} \\ \\ { \tt{RAM = \frac{11481.44}{100} }} \\ \\ { \underline{ \underline{ \tt{ \: RAM = 114.8\: }}}}[/tex]
Which of the following describes humidity?
1) The temperature of the air
2) The weight of the air pressing down on you
3) The amount of water vapor in the air
4) The direction the wind is blowing
Answer: 3) The amount of water vapor in the air.
3.
It was so hard
Explanation:
Nothing
Someone can help me please??
Answer:
gas heating
Explanation:
the rising curves are the states rising in tempurature while the flat sequences are the states of matter actually changing. A-b is the solid heating, then b-c is the melting (changing into liquid), c-d is liquid heating, then d-e is vaporizing, leaving e-f being gas heating.
edit: typo
Answer:
gas heating
Explanation:
that's all I hope it helps
which of the following materials is a mixture?
a. compound
b. oxygen
c. water
d. fruit salad
I wonder what natural chemicals are
Answer:
An unprocessed chemical is one that is found in nature, such as chemicals from plants, micro-organisms, animals, the earth, and the sea. A synthetic chemical is a chemical that is extracted using a process that does not change its chemical composition but does alter its physical or physiological properties.
Explanation:
Can you mark me brainiest, please?
Which statement is true about the temperature and density of air?
Answer: Normally I would need more info but I believe the answer is -Higher temperature air is less dense.
Explanation:
Took The Same Quiz!
How to find average mass
Which metal does not react with dilute hydrochloric acid?
A. Iron
B. Sodium
C. Zinc
D. Copper
Answer:
D. Copper
Explanation:
Less reactive metals like Copper, gold and silver does not react with dilute HCl to produce Hydrogen gas.
Answer:
D. Copper
Explanation:
Copper is less reactive than Hydrogen.
A famous Italian chef wants to open a restaurant in
one of the cities (Mumbai, Denver, Mexico City).
The optimum temperature for cooking pasta is
212°F (100°C). Which city would be the best place
to open the restaurant?
a. Mumbai
b. Denver
c. Mexico City
Mumbai is the best as it has the largest population and the closest temp to that of cooking pasta
Opening a restaurantMumbai an city in India with an average temperature of 33C and a population of about 21,296,516
Denver a city in Colorado in the USA with a temperature of 5C and a population of 705,576 (2019)
Mexico City a city in Mexico with a temperature of 12C and a population of 9 Million persons
Therefore, Mumbai is the best as it has the largest population and the closest temperature to that of cooking pasta
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In the reaction of hydrogen gas and oxygen gas to form water, the glowing splint..
provides the kinetic energy for the reaction
is one of the products of the reaction
provides the activation energy for the reaction
is one of the reactants of the reaction
The glowing splint in the reaction of hydrogen gas and oxygen gas to form water provides the activation energy for the reaction.
Reaction of hydrogen gas and oxygenA chemical reaction involves the combination of two or more substances to yield a new substance which is different from the starting materials. It may also involve the break up a substance.
Since energy is required for a chemical reaction to take place, the glowing splint in the reaction of hydrogen gas and oxygen gas to form water provides the activation energy for the reaction.
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At STP, how many liters of hydrogen are needed to react with 88 g of copper (II) oxide?
Answer:
So if we need to react with 88 gm. of copper 2 then at least 3-4 liters.
Explanation:
(b)
The test-tube transfers thermal energy from the water to the stearic acid.
By what method is most of the thermal energy transferred?
Tick the correct box.
conduction
evaporation
convection
radiation
Since we are missing the diagram to work with, we will answer this assuming that the test tube was placed inside a beaker of stearic acid, in which case the transfer of thermal energy is by way of radiation.
How is thermal energy transferred through radiation?Thermal radiation is the most common method of transferring thermal energy. We see this every day, for example when a cup of coffee becomes colder over time, this is due to the coffee radiating its heat into the surrounding air. The heat will travel in waves through air or water, which is what happens to the test tube and the beaker.
Therefore we can confirm that in the case described and with the assumption made regarding the placement of the test tube, the transfer of thermal energy will be by way of radiation.
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What’s the molecule equation?
Answer:
A molecular equation is an equation in which the formulas of the compounds are written as though all substances exist as molecules. However, there is a better way to show what is happening in this reaction.
Explanation:
#Carry on learning
How does the amount of force applied to an object affect its motion?
The greater the mass the greater the amount of force needed to accelerate the object. More force is required to move a heavier object than a lighter object.
How many atoms are in 72 grams of Calcium (Ca) ?
Answer:
There are a total of 1.13×1024atoms in 75 grams of calcium atoms.
Explanation:
1-10 what is your rating
The compound barium acetate is a strong electrolyte. Write the reaction when solid barium acetate is put into water.
Include states of matter in your answer.
Answer:
Explanation:
If any doubt comment your question or what needs clarification.
The compound barium acetate is a strong electrolyte. The reaction when solid barium acetate is put into water is written as
Ba(C₂H₃O₂)₂ --> Ba ²⁺ + 2 C₂H₃O₂⁻¹
Barium acetate has the molecular formula of Ba(C₂H₃O₂)₂. It is a strong electrolyte. Strong electrolytes are those substances which when dissolved in water dissociates into ions. So when this specific substance is placed into water, this compound simply dissociates into its corresponding ionic forms, that is shown below
Ba(C₂H₃O₂)₂ (s)--> Ba ²⁺ (aq) + 2 C₂H₃O₂⁻¹ (aq)
So here We must take note that the 2+ and 1- are the charges of the ion.
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Fill in the reaction type and predicted products for:
CuSO4 (aq) + Al (s) → ??
Type in the IUPAC name or formula for each product.
Write subscripts as normal numbers.
If there is no second product, type "nothing".
The reaction type is
Question Blank 1 of 3
.
The correct products are:
Question Blank 2 of 3
and
Question Blank 3 of 3
Reaction 1 : Add Zinc to Copper Sulfate.
Observations of Reactants : Zinc is in solid state and copper sulfate in aqueous state.
Predicted Type(s) of Reaction : Single-displacement reaction
Observations of Products : Copper is in solid state and zinc sulfate in aqueous state.
The balanced chemical reaction :
Types of reaction : Single-displacement reaction : It is a type of reaction in which a single element displaces another element in a compound.
Reaction 2 : Mix Potassium Iodide and Lead (II) Nitrate.
Observations of Reactants : Potassium iodide is in solid state and lead nitrate in aqueous state.
Predicted Type(s) of Reaction : Double-displacement reaction
Observations of Products : Lead iodide is in solid state and potassium nitrate in aqueous state.
The balanced chemical reaction :
Types of reaction : Double-displacement reaction : It is a type of reaction in which two reactants exchange their ions to form two new compounds.
Reaction 3 : Burn Copper Wire.
Observations of Reactants : Copper is in solid state and oxygen in gas state.
Predicted Type(s) of Reaction : Oxidation reaction
Observations of Products : Copper oxide is in solid state.
The balanced chemical reaction :
Types of reaction : Oxidation reaction : In a oxidation reaction, a substance gains oxygen.
Reaction 4 : Heat Sodium Carbonate.
Observations of Reactants : Sodium carbonate is in solid state.
Predicted Type(s) of Reaction : Thermal decomposition reaction
Observations of Products : Sodium oxide is in solid state and carbon dioxide in gas state.
The balanced chemical reaction :
Types of reaction : Thermal decomposition reaction : It is defined as the breaking down of a chemical compound due to heating.
TRUE or FALSE
Nonpolar molecules only have nonpolar bonds.
Answer:
its false
Explanation:
srry if its wrong ;-;
Determine the empirical formula of an oxide of nitrogen containing 70% of oxygen. If the relative molecular mass of the oxide is 92. Deduce its molecular mass
The iron oxide has 69.9
The dissolution of ammonium nitrate in water is given by the following equation:
NH4NO3(s) + heat → NH4+(aq) + NO3-(aq)
Which statement best describes what an energy graph of this reaction would look like?
1. The reactants would appear at a lower energy state than the products.
2. The reactants and products would appear at a low energy state.
3. The reactants would appear at a higher energy state than the products.
4. The reactants and products would appear at a high energy state.
In the energy graph of an endothermic reaction, the reactants would appear at a lower energy state than the products.
What is an endothermic reaction?An endothermic reaction is a reaction in which heat is absirbed from the surroundings in order for the reaction to proceed.
In endothermic reactions, the heat content of the products is higher than the heat content of the reactants.
Therefore, in the energy graph of an endothermic reaction, the reactants would appear at a lower energy state than the products.
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Draw the dot structure of CX4
Refer to the attachment
A student studied some rocks found beneath the ground surface and learned that heat and pressure within Earth can change these rocks. Which statement describes how the rocks can change? (LT 4)
Your answer:
The heat and pressure can destroy the minerals in the rocks.
The heat and pressure can erode the rocks to form minerals.
The heat and pressure can rearrange the minerals in the rocks
:()
Answer:
The heat and pressure can rearrange the minerals in the rocks
So what is the easiest thing for each group to do in order to be "happy"?
Group 1:
Group 2
Group 13:
Group 14:
Group 15:
Group 16:
Group 17:
Group 18:
Answer:
cooperate and share ideas between each other and put people with people they know well or work well with.
Explanation:
URGENT! list 16 things in your house or yard that contain oxygen
Answer: 16 different air molecules
Explanation: jhit smart
How is the energy for this process stored?
a) A generator converts solar energy into electricity. Electricity is used to power a
watering system.
b) Electricity powers a watering system. Water flows from the reservoir to the sea
turning a generator which makes electricity.
c) Electricity is used to pump the water from the sea to the reservoir. Water flowing back
down drives a generator which makes electricity.
d) A generator converts solar energy into electricity used to pump water from the sea to
the reservoir.
Answer:
d)A generator converts solar energy into electricity usee to pump water from the sea to the resevoir
A generator converts solar energy into electricity used to pump water from the sea to the reservoir. So, option D is correct.
What is solar energy ?Solar energy works by transforming solar energy into power. Electricity and heat are the two energy types that the sun produces for human use.
Both are produced using solar panels, which may be found on everything from home rooftops to vast "solar farms" covering acres of rural land.
Solar energy is electrical energy produced directly from sunshine. Solar energy can be utilized to generate electricity or thermal energy. Sustainable Energy We don't use any of the Earth's resources, like coal or oil, when we use solar electricity.
Solar energy is a key energy source in the transition to the creation of clean energy since the sun produces more energy than humans could ever require.
Thus, option D is correct.
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how many grams of CaO (mm=56 grams) would be produced from 25.2 grams of CaCo3 (MM=100 grams)
Explanation:
CaCO3 = CaO + CO2
1mol. 1 mol
100. 56
1 ×100. 1 × 56
100. 56
100g of CaCO3 produces 56g of CaO
25.2g of CaCO3 produces x
x = 25.2 ×56
100
x =14.112g of CaO
A calorimetry experiment determined that the combustion of 1.01 g of H2(g) reacting with excess O2(g) gave qsoln = 143 kJ. Calculate ΔH for the reaction: H2(g) + ½ O2(g) → H2O (l)
Answer:
089
Explanation:
I have no idea
Based on the data from the calorimetry experiment, the enthalpy change, ΔH of the reaction is -286 KJ .
What is enthalpy change, ΔH of a reaction?The enthalpy change, ΔH of a reaction is the amount of heat evolved or absorbed when reactant molecules react to form products.
From the calorimetry experiment, the determined heat of combustion of 1.01 g of H2(g) reacting with excess O2(g), qsoln = 143 kJ.
Heat is evolved in the reaction, therefore the qsoln = -143 kJ
Equation of reaction is given as:
H2(g) + ½ O2(g) → H2O (l)
Molar mass of H = 1.01 g
Mass of H2 = 1.01 g × 2 = 2.02 g
ΔH of the reaction = -143 kJ × 2.02/1.01
ΔH of the reaction = -286 KJ
Therefore, the enthalpy change, ΔH of the reaction is -286 KJ .
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You see a boat sitting at the end of a dock. Ten minutes later you see the same boat in a cove to the right of the dock You did not see the boat move.
However, you know that the boat moved because its
relative to the dock changed.
No action is required. The sailboat should change course and speed.
An object is accelerated from rest to a speed of 50m/s in 10 seconds. The acceleration of the object is?
Answer:
dasdw
Explanation: