Posted by hriday on Monday, March 2, 2009 at 5:59am.
Actually, it will depend upon how the quantum efficiency of the photosensitive material varies with frequency. The "quantum efficiency" almost always depends upon wavelength (and therefore frequency), especially near the threshold for the photelectric effect.
In this case, you have a kind of trick question, and an easy answer. Since you halve the frequency and you started out at 1.5 times the threshold frequency, you end up below (at 3/4 of) the threshold frequency for photoelectron emission, and the photocurrent is ZERO.
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