Quantum Physics

Step 1: Use the relationship between energy and frequency of a photon.
The energy

E

of a photon is related to its frequency

f

by:

E%20%3D%20h%20f

f%20%3D%20%5Cfrac%7BE%7D%7Bh%7D

where

h

is Planck’s constant (

h%20%3D%204.1357%20%5Ctimes%2010%5E%7B-15%7D%20%5C%2C%20%5Ctext%7BeV%C2%B7s%7D

). Step 2: Convert the given energy.
The energy of the photon is given as:

E%20%3D%201.326%20%5C%2C%20%5Ctext%7BeV%7D

Step 3: Calculate the frequency.
Using

h%20%3D%204.1357%20%5Ctimes%2010%5E%7B-15%7D%20%5C%2C%20%5Ctext%7BeV%C2%B7s%7D

f%20%3D%20%5Cfrac%7BE%7D%7Bh%7D%20%3D%20%5Cfrac%7B1.326%7D%7B4.1357%20%5Ctimes%2010%5E%7B-15%7D%7D%7D%20%5Capprox%203.206%20%5Ctimes%2010%5E%7B14%7D%20%5C%2C%20%5Ctext%7BHz%7D

Step 4: Match with the options.
The calculated frequency

3.206%20%5Ctimes%2010%5E%7B14%7D%20%5C%2C%20%5Ctext%7BHz%7D

is closest to option (B)

3.20%20%5Ctimes%2010%5E%7B14%7D%20%5C%2C%20%5Ctext%7BHz%7D

Chapter Questions
1 MCQs