List of top Physics Questions on Photoelectric Effect asked in COMEDK UGET

Emission of electrons from a metal plate illuminated with monochromatic electromagnetic radiation will always take place provided

The threshold frequency for a metal surface is $ \nu_0 $. A photoelectric current $ I $ is produced when it is exposed to a light of frequency $ \frac{11}{6} \nu_0 $ and intensity $ I_0 $. If both the frequency and intensity are halved, the new photoelectric current $ I_1 $ will become:

A photon emitted during the de-excitation of electron from a state n to the second excited state in a hydrogen atom, irradiates a metallic electrode of work function 0.5 eV, in a photocell, with a stopping voltage of 0.47 V. Obtain the value of quantum number of the state 'n'.

Let $ K_1 $ be the maximum kinetic energy of photoelectrons emitted by light of wavelength $ \lambda_1 $ and $ K_2 $ corresponding to wavelength $ \lambda_2 $. If $ \lambda_1 = 2\lambda_2 $, then

When a certain metal surface is illuminated with light of frequency $ \nu $, the stopping potential for photoelectric current is $ V_0 $. When the same surface is illuminated by light of frequency $ \frac{\nu}{2} $, the stopping potential is $ \frac{V_0}{4} $. The threshold frequency for photoelectric emission is

Ultraviolet light of wavelength 99 nm falls on a metal plate of work function 1.0 eV. If the mass of the electron is \( 9.1 \times 10^{-31} \) kg, the wavelength of the fastest photoelectron emitted is:

If \(K_1\) and \(K_2\) are maximum kinetic energies of photoelectrons emitted when lights of wavelengths \(\lambda_1\) and \(\lambda_2\), respectively incident on a metallic surface and \(\lambda_1 = 3\lambda_2\), then

The photoelectric threshold for a certain metal is $3600\, \mathring A$. The maximum energy of the ejected photoelectrons by radiation of $2000\, \mathring A$ is (Given $h = 6.62 \times 10^{-34} J \, s$ )

The kinetic energy of the photoelectrons increases by $0.52 \, eV$ when the wavelength of incident light is changed from $500 \, nm$ to another wavelength which is approximately