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Q.

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

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a

Photo-electrons come out with zero speed

b

Photo-electrons come out with 103 m/sec speed

c

No photoelectric emission takes place

d

Photo-electrons come out with 105 m/sec speed

answer is A.

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Detailed Solution

Frequency  of  light  of  wavelength  λ=4000Ao   isv=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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