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                                    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 | 
                            
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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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