A beam of monochromatic light has an intensity I and consists of an unknown number of photons.All of the photons have the same wavelength and frequency.The energy of just one of these photons is smallest when
A)the intensity of the light beam is largest.
B)the frequency of the photons is largest.
C)the wavelength of the photons is largest.
D)All are correct.

Question

Quizplus · Accepted Answer

The energy of a photon is given by E=hf = hc/ λ, where h is Planck's constant, f is frequency, c is the speed of light and λ is wavelength. As the intensity of the light beam increases, the number of photons increases but the energy of each photon remains the same. Similarly, as the frequency of the photons increases, the energy of each photon also increases. However, as the wavelength of the photons increases, the energy of each photon decreases. Therefore, the energy of just one photon is smallest when the wavelength of the photons is largest.

A Beam of Monochromatic Light Has an Intensity I and Consists