A) No photoelectric emission takes place
B) Photo-electrons come out with zero speed
C) Photo-electrons come out with 103 m/sec speed
D) Photo-electrons come out with 105 m/sec speed
Correct Answer: A
Solution :
Frequency of light of wavelength \[(\lambda =4000\ {\AA})\] is \[\nu =\frac{c}{\lambda }=\frac{3\times {{10}^{8}}}{4000\times {{10}^{-10}}}=0.75\times {{10}^{15}}\] which is less than the given threshold frequency. Hence no photoelectric emisssion takes place.
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