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# Light of frequency 1.5 times the threshold frequency, incident on a photo sensitive material. If the frequency of incident light is halved and the intensity is doubled the photo current becomes:

$\begin {array} {1 1} (a)\;one-fourth & \quad (b)\;doubled \\ (c)\;halved & \quad (d)\;zero \end {array}$
Can you answer this question?

(d) zero
answered Nov 7, 2013 by