Physics Dual Nature: Photon and Matter Waves The Photoelectric Effect

The threshold frequency for a metal is 1015Hz . Light of 4000 Å 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 105 m/sec speed 
4
Photo-electrons come out with 103 m/sec speed

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