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 intensity of this light, but keep its wavelength the same (there may be more than one correct answer),

A: the number of electrons emitted from the metal decreases .
B: the number of electrons emitted from the metal does not change.
C: the maximum speed of the emitted electrons does not change.
D: the maximum speed of the emitted electrons 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 and C are correct.

Because, As we decrease the intesity of light, no of photns incident per second on the metal surface decreases. so, no of electrons emitted per second from metal surface decreases. But as the wavelength is constant, energy of incident photon is constant. so, maximum kinetic Energy of emitted electrons remains constant.

E = KEmax + Wo

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