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71. A photosensitive metallic surface has work function huo If photons of energy 2hv, fall on thissurface the electrons come out with a maximum velocity of 4x10 m/s. When the photon energyis increases to 5hu then maximum velocity of photo electron will be[CBSE PMT 2005](a) 2x106 m / s(b) 2 x 10 7 m/s (c) 8 x 105 m /s (d) 8 x 10 m/s

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