1.

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

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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