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Question

Electromagnetic radiation falls on a metallic body whose work function is 2eV. For particular radiation of frequency ν, the maximum kinetic energy of the photoelectron is found to be 4eV. Find the maximum kinetic energy (in eV) of photoelectron for the radiation of 5ν3.

A
8
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B
6
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C
16
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D
12
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Solution

The correct option is A 8
Electromagnetic radiation falls on a metallic body whose work function is 2eV.
hν=ϕ+KEmaxhν=2+4
hν=6eV

Again, h(5ν3)=2+KEmax

53×6=2+KEmax

KEmax=8eV
So, the answer is option (A).

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