Light falling on a metal surface causes electrons to be emitted from the metal b

Question

Light falling on a metal surface causes electrons to be emitted from the metal by the photoelectric effect.

As we decrease the frequency of this light, but do not vary anything else (there may be more than one correct answer),

A: the number of electrons emitted from the metal increases.
B: the maximum speed of the emitted electrons decreases.
C: the maximum speed of the emitted electrons does not change.
D: the work function of the metal increases.

Enter the letters of all the correct answers in alphabetical order. Do not use commas. For instance, if you think assumptions B and D are required, enter BD.

Explanation / Answer

A: the number of electrons emitted from the metal increases.

False as the number of electrons emitted depends on the intensity of incident light

B: the maximum speed of the emitted electrons decreases.

True, The kinetic energy of the emiited electrons depends on the incident frequency

C: the maximum speed of the emitted electrons does not change.

False contradiction to option B

D: the work function of the metal increases

False, work function is the amount of energy needed to remove electron from the plate. This frequency with which it electrons come out is called threshold frequency. So frequency decreses should not be less than threshold frequency because no photoelectric effect occurs.

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