18. Photoelectric work function for a surface is 2.4 eV.
Light of wavelength 6.8 x 10 m shines on the
surface. Find the frequency of incident light and
also the threshold frequency. Will there be photo-
electric emission or not?
(Ans. v = 4.41 x 1044 Hz, v, - 5.82 x 10W4 Hz,
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