Consider the follwing characteristics of the photoelectric effect:

The generation of photoelectrons

The existence of a threshold frequency

The photoelectric current increases with increasing light intensity

The photoelectric current is independent of Delta V for Delta V > 0

The photoelectric current decreases slowly as Delta V becomes more negative

The stopping potential is independent of the light intensity

The photoelectron current appears instantly when the light is turned on.

Which of thesecannotbe explained by classical physics?

Sol83:

The existence of a threshold frequency cannot be explained by classical physics. According to classical physics, the intensity of the light should determine the kinetic energy of the photoelectrons emitted, and there should not be a minimum frequency threshold required for the emission of electrons. However, in the photoelectric effect, electrons are only emitted if the frequency of the incident light exceeds a certain minimum value (threshold frequency), regardless of the intensity of the light. This can only be explained by quantum mechanics.