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Photoelectric Effect
the maximum kinetic energ...
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The maximum kinetic energy of the photoelectrons varies.
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The kinetic energy of photoelectrons depends on the wavelength of light, with shorter wavelengths producing higher energy photoelectrons.
MHT CET - 2024
MHT CET
Updated On:
Nov 26, 2025
Top Questions on Photoelectric Effect
\( 10^{20} \) photons of wavelength 660 nm are emitted per second from a lamp. The wattage of the lamp is:
\[ \text{(Planck's constant} \, h = 6.6 \times 10^{-34} \, \text{Js}) \]
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The work function of a metal is 2 eV. What is the threshold frequency for the photoelectric emission?
(Take Planck's constant $ h = 6.63 \times 10^{-34} \, \text{Js} $, $ 1 \, \text{eV} = 1.6 \times 10^{-19} \, \text{J} $)
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If \(\phi\) is the work function of photosensitive material in eV and light of wavelength of numerical value \(\lambda = \frac{hc}{e}\) metre, is incident on it with energy above its threshold value at an instant then the maximum kinetic energy of the photo-electron ejected by it at that instant (Take \(h\)-Planck’s constant, \(c\)-velocity of light in free space) is (in SI units):
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