1. Tardigrade
  2. Question
  3. Physics
  4. If the frequency of light incident on metal surface is doubled, then kinetic energy of emitted electron will become

Question Error Report

Thank you for reporting, we will resolve it shortly

Back to Question

Q. If the frequency of light incident on metal surface is doubled, then kinetic energy of emitted electron will become

J & K CETJ & K CET 2005

Solution:

From Einstein's photoelectric equation,
we have $E_{k}=h v-W$
where $E_{k}$ is maximum kinetic energy of photoelectrons and $W$ the work function
$\left(=h v_{0}\right)$.
$\therefore E_{k}=h\left(v-v_{0}\right)$ ..(i)
where $v_{0}$ is threshold frequency.
For $h v' =2 h v$
$\therefore 2 E_{k}=2 h\left(v-v_{0}\right)$..(ii)
From Eqs. (i) and (ii),
we observe that kinetic energy of emitted electron will become more than doubled.