Table of contents

9. Quantum Mechanics

The Energy of Light

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Multiple Choice

A photon of light emitted by a heated atom has an energy of 3.285 x 10^-19 J. What is the frequency of this photon in Hz?

4.95 x 10^14 Hz

2.45 x 10^14 Hz

1.23 x 10^15 Hz

6.63 x 10^14 Hz

Verified step by step guidance

Start by recalling the relationship between the energy of a photon and its frequency, given by the equation:

E = h f

, where

E

is the energy of the photon,

h

is Planck's constant, and

f

is the frequency.

Planck's constant

h

is approximately

6.626 \times 10^- 34 J·s

. Use this value in the equation.

Rearrange the equation to solve for frequency

f

f = \frac{E}{h}

Substitute the given energy value

3.285 \times 10^- 19 J

and Planck's constant into the equation:

f = \frac{3.285}{\times}

Calculate the frequency

f

using the values substituted into the equation. This will give you the frequency in Hz.

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