A certain metal when irradiated with light (v = = 3.2 x 1016 Hz) emits photo electrons with twice kinetic energy as did photo electrons when the same metal is irradiated by light (v 2.0 x 1016 Hz). Calculate v, of electron? (1) 1.2 x 1014 Hz (2) 8x 1015 Hz U,0 (3) 1.2 x 1016 Hz (4) 4 x 1012 Hz .
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