Assertion: The photoelectrons produced by a m | vedclass

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(B) According to Einstein's photoelectric equation, $K_{max} = h
u - \Phi$, where $h
u$ is the energy of the incident photon and $\Phi$ is the work

Vedclass · Accepted Answer

If both Assertion and Reason are correct but Reason is not a correct explanation of the Assertion.

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(B) According to Einstein's photoelectric equation, $K_{max} = h
u - \Phi$, where $h
u$ is the energy of the incident photon and $\Phi$ is the work function of the metal.While the maximum kinetic energy is fixed for a given frequency, photoelectrons are emitted from different depths within the metal surface.Electrons emitted from deeper layers lose some energy due to collisions before escaping the surface, resulting in a range of kinetic energies from $0$ to $K_{max}$.Thus, the Assertion is correct.The work function $\Phi$ is indeed a characteristic property of the metal, making the Reason correct.However, the Reason does not explain why there is a spread in kinetic energies; the spread is due to the varying depths of emission and subsequent energy loss.Therefore, both are correct, but the Reason is not the correct explanation of 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 is its characteristic property.

Similar Questions

When monochromatic radiation of intensity $I$ falls on a metal surface, the number of photoelectrons and their maximum kinetic energy are $N$ and $K$ respectively. If the intensity of radiation is $2I$, the number of emitted electrons and their maximum kinetic energy are respectively

The threshold frequency for a metal is $10^{15} \ Hz$. Choose the correct statement when light of wavelength $4000 \ \mathring A$ is incident on it.

From the following graph of photo-current against collector plate potential,for two different intensities of light $I_{1}$ and $I_{2}$,one can conclude:

Assertion : Photoelectric saturation current increases with the increase in frequency of incident light.
Reason : Energy of incident photons increases with increase in frequency and as a result photoelectric current increases.

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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 is its characteristic property.