Question

According to Einstein's theory, the energy of a photon is a. proportional to its wavelength.

b. proportional to its frequency.
c. constant, since the speed of light is a constant.

Answer 1

Einstein's photoelectric equation giving the energy contained in a photon:

E = hf

E = energy of the photon, h = Planck's constant, f = frequency

The energy is proportional to the frequency.

Choice B