A photosensitive metallic surface has work function, h 0 . If photons of energy 2h 0 fall on this surface, the electrons come out with a maximum velocity of 4 10 6 m/s . When the photon energy is increased to 5h 0 , then maximum velocity of photo electrons will be

1. A. 2 10 7 m/s
2. B. 2 10 6 m/s
3. C. 8 10 5 m/s
4. D. 8 10 6 m/s

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