Vitamin D is produced in the skin when 7-dehydrocholesterol reacts with UVB rays (ultraviolet B) having wavelengths between
270 nm and 300 nm. What is the energy range of the UVB photons?

Answers

Answer 1

UVB photons, with wavelengths between 270 nm and 300 nm, have energies in the range of 6.63 × 10⁻¹⁹ J - 7.37 × 10⁻¹⁹ J.

UVB rays have wavelengths (λ) between 270 nm and 300 nm. We can calculate the energy (E) associated with each wavelength using the Planck-Einstein's relation.

[tex]E = \frac{h \times c}{\lambda }[/tex]

where,

h: Planck's constant (6.63 × 10⁻³⁴ J.s)c: speed of light (3.00 × 10⁸ m/s)

The energy associated with a wavelength of 270 nm is:

[tex]E = \frac{h \times c}{\lambda } = \frac{(6.63 \times 10^{-34}J.s ) \times (3.00 \times10^{8}m/s )}{270 \times 10^{-9}m } = 7.37 \times 10^{-19} J[/tex]

The energy associated with a wavelength of 300 nm is:

[tex]E = \frac{h \times c}{\lambda } = \frac{(6.63 \times 10^{-34}J.s ) \times (3.00 \times10^{8}m/s )}{300 \times 10^{-9}m } = 6.63 \times 10^{-19} J[/tex]

UVB photons, with wavelengths between 270 nm and 300 nm, have energies in the range of 6.63 × 10⁻¹⁹ J - 7.37 × 10⁻¹⁹ J.

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Related Questions

Which gases contribute more significantly to Global warming

Answers

Answer:

Carbon dioxide

Explanation:

A byproduct of fossil fuel combustion, is the principal greenhouse gas contributing to global warming. However, other greenhouse gases including methane, nitrous oxide, and a number of industrial-process gases also are important contributors to climate change.

Write for empiricalformula
Fe2+, cr4+, cl-, O2-

Answers

Answer:

{eq}Fe^{2+} {/eq} and {eq}I^- {/eq} forms {eq}FeI_2 {/eq}

{eq}Fe^{2+} {/eq} and {eq}S^{2-} {/eq} forms {eq}FeS {/eq}

{eq}Cr^{4+} {/eq} and...

Explanation:

Empirical formula:

The empirical formula gives the simple ratio of the different types of atoms in a compound. It is different from the molecular formula, which gives the exact number of each type of atom in a compound.

The negatively charged particle that is released from the nucleus at high speeds is the _____.

a. alpha particle
b. beta particle
c. neutron
d. gamma ray

Answers

Answer:

The negatively charged particle that is released from the nucleus at high speeds is the beta particle.

How many grams of carbon are in 243.3 g
of carbon tetrachloride?

Answers

Look at the formula then multiply by how ever many it says

Every compound is a molecule, but every molecule is not a compound. Why is this? Give an example with your answer. Plz help mehhh TvT

Answers

Answer:

By definition, a molecule is a group of atoms bonded together. This means that it can be a mixture of two separate atoms (e.g. atom A and atom B bond together to make molecule AB). Molecules with two or more separate elements are called compounds.

Molecules can also be made of more than one atom of the same element (e.g. atom A bonds to another A atom to make molecule AA). This is not called a compound because they are not different elements.

what force/ area causes gas pressure​

Answers

Answer:

i would think its rapid motion and collision of molecules causing pressure.

Explanation:

it depends on the number so the more gas molecules collide, the more pressure there is. sorry if this doesn't help.

Answer:

collisions of gas particles with the walls of the container.

Explanation:


A prospector panning for gold (Au) in a river collects 15.00 g of pure gold. How many Au atoms are in this quantity of gold?

Answers

Answer:

There are 4.59*10^-24 atoms in 15.00 of pure gold.

Explanation:

Molar mass of gold is 196.996g/mol

[tex]\frac{15}{196.966} =0.076 mol[/tex]

0.076*(6.022*10^-23)=4.59*10^-24

List the three pieces of evidence for sea floor spreading that also support the theory of continental drift

Answers

Answer:

molten material, seafloor drilling, radiometric age dating and fossil ages, and the magnetic stripes

Explanation:

How many atoms are present in 0.529 moles of Li?

Answers

Answer:

3.18 × 10²³ atoms

Explanation:

The number of atoms can be found by using the formula

N = n × L

where n is the number of moles

N is the number of entities

L is the Avogadro's constant which is

6.02 × 10²³ entities

From the question we have

N = 0.529 × 6.02 × 10²³

We have the final answer as

3.18 × 10²³ atoms

Hope this helps you

Determine the formal charge on each atom in the structure.

Answers

Answer:

−0.75 , 1.25

Explanation:

Please refer to attachment for more information

Perform the following calculation and report the answer with the correct number of significant figures.
81.72 +0.73 =

Answers

Answer:

81.72 +0.73=82.45

Explanation:

you need to add it

1

81.72

+0.73

= 82.45

82.72 + 0.73 = 82.45

Explanation:

0.72+0.73 = 1.45

Therefore 81+1.45= 82.45 ( Integer in addition with a decimal number).

What feature of living things do the terms unicellular and multicellular describe ?

a. how they are organized
b. how they reproduce
c. how they maintain temperature
d. how they produce macromolecules

Answers

Answer:

The term unicellular and multicellular describe how living things are organized.

Explanation:

The number of cells in living things determine how the body organization will be.

Living things are made up of cells in which there are two types of living cells. We have the unicellular and multicellular cells.

The unicellular are made up of one cell (single cell) the unicellular organisms are simple cells which make their functions simple while the multicellular organisms are made up of two or more organisms and their functions are special unlike the unicellular which the functions are simple

Explanation:

Answer:

Hey there

A) how they are organized.

Multicellular organisms are organized by being made of many cells, such as you and me. However unicellular organisms as the name suggest are made of only one cell, such as bacteria.

1. What is the purpose of the advertisement?​

Answers

Answer:

For enlightenment, development and making people understand the usefulness of the product

Answer:

AKA "AD"AND ADS EXPLAIN WAYS IN WHICH THE PRODUCT IS USEFUL ... PLEASE MARK ME AS BRAINLIST

The beaker is left until there is no further change in the appearance of the liquid. And the options for the answer are : A : All the liquid is purple. B : None of the liquid is purple. C : Only the bottom half of the liquid is purple. D : Only the top half of the liquid is purple

Answers

Answer:

none of the liquid is purple

Convert 6.800 x 10^-3 km to cm.

Answers

Answer:

680 centimeters

Explanation:

because it is

Please help me with this question it’s really confusing and I need it done in 8 minutes I’ll give you extra credit :))

Answers

Answer:

pls say the question

Answer:

i cant see anything maybe make the picture bigger,

Explanation: maybe thall help

Balance the following chemical equation and determine the number of moles of Fe(s) produced when 8.1E-1
moles of Fe2O3(s) react with excess C(s) to produce Fe(s) and CO2(g).
Fe2O3(s) + C(s) ——)Fe(s) + CO2(g)

Answers

Answer:

2Fe2O3 + 3C → 4Fe + 3CO2

Explanation:

The balanced reaction of Ferric oxide with carbon to form Iron and Carbon dioxide can be written as follows:

[tex]2Fe_{2} O_{3} +3C\rightarrow4Fe+3CO_{2}[/tex]

The moles of iron produced is[tex]16.2*10^{-1}[/tex]

What is balanced equation?

Balanced equation is the one where the number of atoms of each species is same on reactant and product side. In balanced equation mass can neither be created nor be destroyed.

The atoms of Oxygen on reactant side is 3 while on product side is 2 so multiply Ferric oxide by 3 and carbon dioxide by 3

so now our equation becomes

[tex]2Fe_{2} O_{3} +C\rightarrow Fe+3CO_{2}[/tex]

The number of Carbon atoms on left side is one while on right side it is 3 so multiply by 3

[tex]2Fe_{2} O_{3} +3C\rightarrow Fe+3CO_{2}[/tex]

The number of Iron atoms on left is 4 while on right it is 1 so multiply by 4

[tex]2Fe_{2} O_{3} +3C\rightarrow4Fe+3CO_{2}[/tex]

From 2 moles of Ferric oxide 4 moles of iron is produced

from 1 mole mole of ferric oxide 2 moles of Iron is produced

From [tex]8.1*10^{-1}[/tex] mole of ferric oxide 2×[tex]8.1*10^{-1}[/tex] moles of iron are produced.

Hence the balanced equation is

[tex]2Fe_{2} O_{3} +3C\rightarrow4Fe+3CO_{2}[/tex]

the number of mole of Iron is [tex]16.2*10^{-1}[/tex]

Learn more about the balanced equations, here:

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How large are dwarf galaxies compared to the Milky Way galaxy?

Answers

Answer:

A dwarf galaxy is a small galaxy composed of about 1000 up to several billion stars, as compared to the Milky Way's 200–400 billion stars

Answer:

A dwarf galaxy is a small galaxy composed of about 1000 up to several billion stars, as compared to the Milky Way's 200–400 billion stars.

Explanation:

same answer for me

Which element has the largest atomic radius?
4 be
56 ba
31 ga
9 f

Answers

Answer:

Ba

Explanation:

bc it = 268 pm

How many mols are present in 5.24 x 1024 atoms of Carbon tetra fluoride?

Answers

Answer: 5.44×10226.022140857(74)×1023⋅mol−1.

Explanation: So the answer is approx. 0.10⋅mol

Two chemical reactions are shown:


2Mg + O2 → 2MgO
CaCO3 → CaO + CO2

Which statement is true?

A. Both are synthesis reactions.
B. Both are decomposition reactions.
C. A is a synthesis reaction, and B is a decomposition reaction.
D. A is a decomposition reaction, and B is a synthesis reaction.

Answers

In the given chemical reactions, the statement that is true is A synthesis reaction, and B is a decomposition reaction. The correct option is C.

What are synthesis and decomposition reactions?

Synthesis reactions are those reactions in which two reactants combine to form a single big product or compound. Like the first one reaction in which the magnesium and oxygen combine to create two moles of magnesium oxide. A + B = AB. When

Decomposition reactions are those reactions in which one reaction or compound breaks down to comprise two smaller products. Like the second reaction, calcium chloride breaks down into calcium oxide and carbon dioxide. AB = A + B.

Thus, the correct option is C. A is a synthesis reaction, and B is a decomposition reaction.

To learn more about decomposition reactions, refer to the link:

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The total pressure in a mixture of gases is equal to the partial pressure(s) of ________. the gas that occupies the largest volume the gas with the smallest number of moles all the gases added together the gas with the highest molecular weight the gas with the greatest number of moles

Answers

The total pressure in a mixture of gases is equal to the partial pressure of all the gases added together

According to Dalton's Law of Partial Pressure,  The total pressure exerted by a mixture of gases which are non reacting is equal to the sum of the partial pressure of each individual gas that make up the mixture

Mathematically, Ut can be written as

P{total}= p1+p2, ....+ pn

where p1, p2, …, pn are partial pressures of each gas component.

For example :A gaseous mixture consisting of Helium and Nitrogen gas . If the pressure exerted by He is 3 atm while Nitrogeb exerted is 9 atm. The total pressure will be:

P{total}= p1+p2, ....+ pn

P{total}= 3+9

P{total}= 12

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Ethan makes the table below to record his observations when mixing baking soda and vinegar in a beaker. Ethan claims that a chemical change has occurred. Which statement provides the BEST evidence to support his claim?

Answers

Answer: a

Explanation:

Many bubbles formed after mixing.

The statement which best provides support for the fact that a chemical change has occurred is that many bubbles formed after mixing.

In a chemical change, new substances are formed and there is a recombination of the atoms in reactants as the products are being formed.

There are several cues that indicate that a chemical change has taken place such as;

Appearance of a solid in an aqueous phase reaction.Evolution of gasSudden change in the temperature of the systemChange in the color of the system

In the particular instance in this question, when baking soda and vinegar were mixed together, a gas was evolved signifying that a chemical change has taken place.

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WILL MARK BRAINLIEST
What occurs when energy is added or removed from an object or a system by an outside agent?
Potential Energy
Kinetic Energy
Elastic Potential Energy
Thermal Energy
Work

Answers

Answer:

Its Thermal Energy

Explanation:

What’s a nonmetal that gains 3 electrons to be stable like neon

Answers

Answer:

Phosphorus would be the correct answer I guess

WILL GIVE BRAINLIEST AND 20 POINTS!
A 6.0 M NaOH solution is made with 400 grams of NaOH. How much do you have?

M = mol/L

L = mol/M

Answers

Answer:

10 mol, or 1.667L

Explanation:

__mol=400gNaOH * [tex]\frac{1mol}{39.99g}[/tex]

__L=400gNaOH * [tex]\frac{1mol}{39.99g}[/tex]  * [tex]\frac{1L}{6M}[/tex]

Which one are you solving for? The top is for number of moles and the bottom is number of liters. You already have the mass so you are obviously not solving for that.

QUESTIONS
71. The temperature scale used in everyday life in most of
the world except the United States is the
scale.

Answers

Celsius or metric scale

Assuming an efficiency of 49.70%, calculate the actual yield of magnesium nitrate formed from 139.0 g of magnesium and excess copper(II) nitrate. Mg+Cu(NO3)2⟶Mg(NO3)2+Cu

Answers

Answer:

221.5 g

Explanation:

if you want a step by step problem feel free to ask

Calculate the entropy change for the gas. (2b)Calculate the entropy change when 14 g of nitrogen expand from a volume of 10 L to a volume of 30 L at the same temperature. Assuming ideal behaviour for the nitrogen gas​

Answers

Explanation:

because T is const so

deltaS=Q/T=nRLn(V2/V1)

=(14/28)x8.314xLn(30/10)=4,567 J/k


Help I believe it’s B or A

Which term describes the crust and the upper part of the mantle broken into large tectonic
plates?

A ) Outer core

B ) Lithosphere

C ) Asthenosphere

D )Mantle


Answers

It’s B
Hope it helps
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