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Threshold frequency for a metal is 2 x 106 Hz. Minimum value of frequency of light to produce photo electric effect will be -(1) 2 x 106 Hz(2) 4 x 106 Hz(3) 106 Hz(4) None of these |
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Answer» Correct option is (1) 2 x 106 Hz KE = hv - hvth For minimum frequency KE = 0 vh = hvth v = vth |
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