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Question

Threshold frequency for a metal is 1015Hz. Light of λ=4000A falls on its surface. Which of the following statements is correct 



Correct Answer
A

No photoelectric emission takes place

Your Answer
B

Photo-electrons come out with zero speed

Your Answer
C

Photo-electrons come out with 103 m/sec speed
 

Your Answer
D

Photo-electrons come out with 105 m/sec speed


Solution

The correct option is A

No photoelectric emission takes place


Frequency of light of wavelength (λ=4000 A) is v=cλ=3×1084000×1010=0.75×1015 which is less than the given threshold frequency. Hence no photoelectric emisssion takes place.
 

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