1.

Radiations of frequency 1.5 timesthe threshold frequency falls on aphotosensitive material and a photocurrent of I is obtained. If the intensityof incident radiation is doubled andfrequency is reduced of half, the photocurrent becomes

Answer»

If the frequency is halved and intensity is doubled the frequency if incident light become 1.5/2=0.75 time the threshold frequency .Hence photoelectric current will be zero



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