50. Which of the following observations in the photoelectric effect experiment can beexplained by the wave behavior of light?
(A) There is a cutoff frequency below which no photoelectric current can beobserved.
(B) Photoelectric current increases with increasing the intensity of the light.
(C) There is a stopping potential for photoelectric current regardless the intensityof the light.
(D) Dependence of ejection of electrons on light frequency.
(E) Dependence of photoelectron kinetic energy on light frequency.