The electrons are emitted in the photoelectric effect from a metal surface

Options

(a) Only if the temperature of the surface is high
(b) with a maximum velocity proportional to the frequency of the incident radiation
(c) only if the frequency of the incident radiation is above a certain threshold value
(d) at a rate that is independent of the nature of the metal

Correct Answer:

only if the frequency of the incident radiation is above a certain threshold value

Explanation:

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