Tripling the wavelength of the radiation from a monochromatic source will change the energy content of the individually radiated photons by what factor?
A)0.33
B)1.0
C)1.73
D)3.0

Question

Quizplus · Accepted Answer

The energy of a photon is inversely proportional to its wavelength, and directly proportional to its frequency. Tripling the wavelength means reducing the frequency by a factor of 3. Since energy is directly proportional to frequency, energy of a photon will decrease by a factor of 1/3, which is approximately 0.33. Therefore, the correct answer is (A).

Tripling the Wavelength of the Radiation from a Monochromatic Source