Chapter 38, Problem 31A

To determine

Whether the green light beam or red light beam contains greater number of photons.

Explanation of Solution

Introduction:

The number of photons of the incident light depends on the frequency of the light. If the frequency of the light is more than the number of photon it contains also become higher.

The energy of the red light beam is same as the green light beam, so the total number of photons for both beams must be same.

The frequency of the green light beam is higher than the frequency of the red light beam, so the energy of individual photon of red light beam is more than the energy of individual photon of the red light beam. The number of photons of red light beam is more than the number of photons of green light beam due to more energy of the photon of red light beam than the green light beam.

Conclusion:

The number of photons of red light beam is more than the number of photons of green light beam due to more energy of the photon of red light beam than the green light beam.