PROBLEM 38P

List these three types of electromagnetic radiation—visible, gamma rays, and microwaves—in order of:

(a) decreasing energy per photon

(b) decreasing frequency

(c) decreasing wavelength

Solution 38P

According to Einstein, the amount of energy ( E ) in a light is dependent on its

frequency ( n ) according to the following equation:

Where, h = Planck’s constant, ,

where

Therefore ,

The electromagnetic spectrum is given below

(a) decreasing energy per photon

According to the equation,

The decreasing order of energy per photon is as follows

Gamma rays > visible > Microwave radiation

(b) decreasing of frequency

According to the equation,

The decreasing order of frequency is as follows

Gamma rays > visible > Microwave radiation

(c) decreasing of wavelength

According to the equation,

The decreasing order of wavelength is as follows

Microwaves > Visible > gamma rays