Dual Nature of Radiation and Matter

Question: Threshold frequency for a metal is ${10^{15}}$Hz. Light of $\lambda = 4000{\AA}$falls on its surface. Which of the following statements is correct



1) No photoelectric emission takes place
2) Photo-electrons come out with zero speed
3) Photo-electrons come out with 103 m/sec speed
4) Photo-electrons come out with 105 m/sec speed
Solution: Explanation: No Explanation
Photon and Photoelectric Effect

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