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Question

Threshold frequency for a metal is 105 Hz. If light of wave length 4000oA falls on its surface then among the following correct statement is:

A
Photo electrons come out with zero speed
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B
Photo electrons come out with 103m/s speed
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C
Photo electrons come out with 105m/sspeed
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D
No photo electric emission takes place.
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Solution

The correct option is C No photo electric emission takes place.
Frequency of light of wavelength (λ=4000Ao) is
v=cλ=3×1084000×1010=0.75×1015 which is less than the given threshold frequency. Hence no photoelectric emission takes place.


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