Question

Which one of the following is true in photoelectric emission
A. Photoelectric current is directly proportiona to the amplitude of light of given frequency
B. Photoelectric current is directly proportional to the intesity of light of a given frequency above threshold value
C. Above the threshold frequency the maximum K.E. of photoelectronsis inversely proportional to the frequency of incident light
D. The threshold frequency depends upon the wavelength of incident light

Answer 1

Correct Answer - B
For threshold frequency, `hv_(0) = phi rArr v_(0) = (phi)/(h)`
`rArr KE_("max") = hv - phi = h(v-v_(0))`
`I_("saturation") prop n` where `I = nhv`