The energy of a photon from certain wavelength is 1.37 x 10^-20 j, what is the frequency in hz?

Chemistry

1 answer:

Anika [276]2 years ago

3 0

Answer:

frequency = 2.07 x 10¹³ Hz

Explanation:

To find the frequency of the photon, you need to use the following equation:

E = hv

In this formula,

-----> E = energy (J)

-----> h = Planck's Constant (6.626 x 10⁻³⁴ J*s)

-----> v = frequency (Hz)

Since you have been given values for two of the variables (in the correct units), you can plug them into the equation and simplify to find the frequency.

E = hv <----- General Equation

E = (6.626 x 10⁻³⁴ J*s)v <---- Plug in Planck's Constant

1.37 x 10⁻²⁰ J = (6.626 x 10⁻³⁴ J*s)v <----- Plug in energy (given)

2.07 x 10¹³ = v <----- Divide both sides by 6.626 x 10⁻³⁴

You might be interested in

What is the oxidation state of each element in the compound CaS04? Include +or - in your answer as appropriate

borishaifa [10]

Answer:therefore the oxidation state of sulphur is +6 in the compound CaSO4.

Explanation:

5 0

3 years ago

Calculate how many grams would be required to prepare 600. 0 ml of 0. 150 m of naf? molar mass of naf is 41. 9 g/mo

marta [7]

Considering the definition of molarity and molar mass, the mass of NaF required is 3.771 grams.

<h3>Definition of molarity</h3>

Molar concentration or molarity is a measure of the concentration of a solute in a solution and indicates the number of moles of solute that are dissolved in a given volume.

The molarity of a solution is calculated by dividing the moles of solute by the volume of the solution:

$molarity=\frac{number of moles}{volume}$

Molarity is expressed in units $\frac{moles}{liters}$ .

<h3>Definition of molar mass</h3>

The molar mass of substance is a property defined as its mass per unit quantity of substance, in other words, molar mass is the amount of mass that a substance contains in one mole.

<h3 /><h3>Mass of NaF required</h3>

In this case, you know:

molarity= 0.15 M= 0.15 $\frac{moles}{L}$
number of moles= ?
volume= 600 mL= 0.6 L

Replacing in the definition of molarity:

$0.15\frac{moles}{L} =\frac{number of moles}{0.6 L}$

Solving:

0.15 $\frac{moles}{L}$ × 0.6 L= number of moles

<u><em>0.09 moles= number of moles</em></u>

The molar mass of NaF is 41. 9 g/mol. So, you can apply the following rule of three: If by definition of molar mass 1 mole of the compound contains 41.9 grams, 0.09 moles of the compound contains how much mass?

$mass=\frac{0.09 molesx41.9 grams}{1 mole}$