Find the maximum magnitude of the linear momentum of a photoelectron emitted when light of wavelength 400 nm falls on a metal having work function 2.5 eV.
Given, wavelength λ =400×
Work function=2.5eV
From photoelectric equation,
Where K is kinetic energy,
h is Planck’s constant,
c is speed of light,
Ф is the work function,
is the wavelength of light.
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We also know that,
Where P is linear momentum and m is mass of electron
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⇒ .