Assertion : The photoelectrons produced by a | vedclass

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Question

(A) Photoelectrons emitted from a metal surface exhibit a range of kinetic energies because electrons within the metal occupy different energy levels

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If both Assertion and Reason are correct and the Reason is a correct explanation of the Assertion.

Vedclass · Answer

(A) Photoelectrons emitted from a metal surface exhibit a range of kinetic energies because electrons within the metal occupy different energy levels within a continuous band structure. When a photon strikes the metal,it transfers its energy to an electron. The energy required to remove an electron from the surface is the work function. Electrons located deeper within the metal require additional energy to reach the surface before they can be emitted,effectively increasing the energy barrier for them. Consequently,electrons emitted from different depths have different kinetic energies. Thus,both the Assertion and the Reason are correct,and the Reason provides a valid explanation for the Assertion.

Assertion : The photoelectrons produced by a monochromatic light beam incident on a metal surface have a spread in their kinetic energies.
Reason : The work function of the metal varies as a function of depth from the surface.

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Assertion : The photoelectrons produced by a monochromatic light beam incident on a metal surface have a spread in their kinetic energies.Reason : The work function of the metal varies as a function of depth from the surface.