List of top Physics Questions on Photoelectric Effect asked in UP Board XII

Find the maximum kinetic energy of the photo-electrons ejected, when light of wavelength 3300 Å is incident on a Cesium surface. Work function of Cesium = 1.9 eV.
What is the photoelectric effect? Which nature of light is shown by it? Threshold frequency of a metal is \(2.3 \times 10^{14}\) Hz. If the frequency of incident light is \(8.2 \times 10^{14}\) Hz, what will be the stopping potential? Calculate work function of the metal also.
Write down Einstein's equation for the photoelectric effect.
Which nature of light is supported by the phenomenon of photoelectric effect? Write Einstein's equation related to photoelectric emission and briefly explain the laws of photoelectric emission on its basis.
Threshold wavelength for a metal surface is 2000 \AA. On incidence of radiation of 1000 \AA, the kinetic energy of emitted photoelectrons will be
What is the meaning of stopping potential in photoelectric effect?
The stopping potential for the photoelectric current is obtained as 4 V for a metal surface by a monochromatic light of wavelength \( \lambda \), incident on it. The stopping potential becomes \(V\) for the incident light of wavelength \( 2\lambda \) on this surface. Find the formula of threshold wavelength \( \lambda_0 \) in terms of \( \lambda \).
Define work-function.
What is the photo-electric effect ? Write its laws. Establish the Einstein's equation of photoelectric effect \(\frac{1}{2} mv^2 = h(\nu - \nu_0)\).
What is meant by threshold wavelength in photoelectric effect?
What is meant by threshold wavelength \( \lambda_0 \) and threshold frequency \( \nu_0 \) in photoelectric effect? On which factors do the saturation current and the value of cut-off voltage depend?

Write down Einstein's photoelectric equation. Photons of energies 1 eV and 2.5 eV respectively are incident on a metal plate of work function 0.5 eV. If maximum kinetic energies of emitted photoelectrons are \( k_1 \) and \( k_2 \) respectively and their velocities are \( v_1 \) and \( v_2 \), then find the magnitudes of (i) \( k_1/k_2 \) and (ii) \( v_1/v_2 \).

Threshold wavelength for a photoelectric cell is \( \lambda_0 \). If the work-function of the cathode of some other cell becomes \( n \) times that of the first cell, then threshold wavelength for the other cell will be: