Photoelectrons of different kinetic energies were emitted from a photosensitive plate, when radiations from a source of variable frequency were incident on the plate. It was found that for a frequeny of `8xx10^(14)` Hz, the kinetic energy of the photoelectrons became zero. What was the work function of the plate in eV ? `[h=6.6xx10^(-34) Js]`

Options

A. 4.3 eV
B. 2.5 eV
C. 3.3 eV
D. 0.5 eV

Answer

C

Explanation

When `v=v_(0)`, then K.E. of the emitted photoelectron is zero.
`:.v_(0)=8xx10^(14)Hz :.W_(0)=hv_(0)=3.3 eV`