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Emission of photoelectrons from a metal plate illuminated with monochromatic electromagnetic radiation will always take place provided

$\begin{array}{1 1} \text{(a) The radiation is sufficiently intense.} \\\text{(b) The work function of the plate is less than the energy of a single photon and the plate is uncharged.} \\ \text{(c) The wavelength of the radiation exceeds a minimum value.} \\ \text{(d) The plate is freshly cleaned. } \end{array}$

Ans : (b)
The key to the question is “…will always take place”.
A freshly cleaned plate will only exhibit photoelectric emission
if the radiation frequency is greater than a certain minimum value.

edited Mar 13, 2014