1. Tardigrade
  2. Question
  3. Physics
  4. A photon of energy 2.5 eV and wavelength λ falls on a metal surface and the ejected electrons have velocity v. If the λ of the incident light is decreased by 20%, the maximum velocity of the emitted electrons is doubled. The work function of the metal is

Question Error Report

Thank you for reporting, we will resolve it shortly

Back to Question

Q. A photon of energy 2.5 eV and wavelength $\lambda$ falls on a metal surface and the ejected electrons have velocity v. If the $\lambda$ of the incident light is decreased by 20%, the maximum velocity of the emitted electrons is doubled. The work function of the metal is

Dual Nature of Radiation and Matter

Solution:

$\frac{\nu^2_1}{\nu_2^2} = \frac{\frac{hc}{\lambda_1} - \omega}{\frac{hc}{\lambda_2} - \omega}$
use $E = \frac{12400}{\lambda(A^0)} $