Which one of the following is true in the photoelectric emission?(a) The threshold frequency depends upon the wave length of incident light(b) Above the threshold frequency the maximum K.E. of photoelectron is inversely proportional to the frequency of incident light.(c) Photoelectric current is directly proportional to the intensity of light of a given frequency at moderate intensities.(d) Photoelectric current is directly proportional to the intensity of light of given frequency.
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(a) The threshold frequency depends upon the wave length of incident light
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