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11 122. A light of frequency 1.6 x 1016 Hz when falls on a metal plate emits electrons that have double the kinetic energy compared

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11 122. A light of frequency 1.6 x 1016 Hz when falls on a metal plate emits electrons that have double the kinetic energy compared to the kinetic energy of emitted electrons when frequency of 1.0 x 10'6 Hz falls on the same plate. The threshold frequency (v.) of the metal in Hz is (a) 1 x 1015 (b) 4 x 10' (c) 3 x 10'5 (d) 4 x 1013

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