ultra violet light of wave length $2271A^{\circ}$ from a 100 w mercury source irradiates a photocell made of molybdenum metal. If the stopping potential is $13.v$ estimate the work function of the metal. How would the photo cell respond to a high intensity $(10^5wm^{-2})$ red light of wave length $6328\;A^{\circ}$ produced by $He- Ne$ laser ?

Question

$\begin{array}{1 1} \text{The photocell will respond strongly become} \gamma_r > \gamma_0 \\ \text{The photo cell will respond slowly because } \gamma_r = \gamma_0 \\ \text{The photo cell will not respond because } \gamma_r < \gamma_0 \\ \text{None of the above} \end{array} $