The experimental observation(s) below that require(s) a quantum explanation for the photoelectric effect
A) is that more photoelectrons are emitted when the light frequency increases.
B) is that the maximum kinetic energy of the photoelectrons is related linearly to the frequency of the light.
C) is that every metal surface has a work function, a minimum amount of energy needed to free electrons.
D) is that the stopping potential measures the kinetic energy of the photoelectrons.
E) are all of the above.

Question

Quizplus · Accepted Answer

The observation that the maximum kinetic energy of the photoelectrons is related linearly to the frequency of light is a key experimental observation that requires a quantum explanation. According to classical physics, increasing the intensity of the light should increase the number of electrons emitted, but not the kinetic energy of the photoelectrons. Only a quantum explanation, using the concept of photons and their energy, can explain why increasing the frequency of light increases the kinetic energy of the photoelectrons.

The Experimental Observation(s) Below That Require(s) a Quantum Explanation for the Photoelectric