Electromagnetic radiation having `lamda`=310 Å is subjected to a metal sheet having work function =12.8 eV. What will be the velocity of photo-electrons having maximum kinetic energy.

Options

A. 0, no emission will occur
B. `4.352xx10^(6)` m/s
C. `3.09xx10^(6)` m/s
D. `8.72xx10^(6)` m/s

Answer

C