Question

When monochromatic radiation of intensity falls on a metal surface, the number of photoelectron and their maximum kinetic energy are n and t respectively. If the intensity of radiation is' 2i, the number of emitted electrons and their maximum kinetic energy are respectively?

Answer 1

According ro einsteins photoelectric equation,

E =hv° + 1/2mv^2

Here,

Intensity of incident radiation is directly proportional to the number of emitted photoelectrons therefore, no. of photoelectrons becomes twice the original and maximum kinetic energy remains unaffected because it is independent of intensity of incident radiation and is directly proportional to frequency of incident monochromatic light

As a result,

No. of photoelectrons becomes 2n and maximum K.E remains t

I hope it helps

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