Question

In photo-electric effect, when photons of energy ${}^{\prime }hv{}^{\prime }$ are incident on a metal surface, electrons are emitted with some kinetic energy. It is possible to say that

• A. All ejected electrons have same K.E. equal to $h{v}_0$
• B. The ejected electrons have a distribution of K.E. from zero to $hv-h{v}_0$
• C. The most energetic electrons have K.E. equal to $hv$
• D. All ejected electrons have K.E. equal to $hv$

Answer 1

Answer: (B)

The ejected electrons have a distribution of K.E. from zero to $hv-h{v}_0$

$hv=h{v}_0+K.E.$ for emitted electrons, its possible that they have a K.E from zero to $hv-h{v}_0$. Hence correct option is B.