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Assertion : The number of electrons ejec...

Assertion : The number of electrons ejected from a metal surface depend upon the frequency of light.
Reason : There is a time lag between the striking of light beam and the ejection of electrons from the metal surface.

A

If both assertion and reason are true and reason is the correct explanation of assertion.

B

If both assertion and reason are true but reason is not the correct explanation of assertion.

C

If assertion is true but reason is false.

D

If both assertion and reason are false.

Text Solution

Verified by Experts

The correct Answer is:
D
The number of electrons ejected is proportional to the intensity or brightness of light and the electrons are ejected from the metal surface as soon as the beam of light strikes i.e., there is no time lag between the striking of light beam and the ejection of electrons from the metal surface.
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Knowledge Check

  • Electrons are ejected from a metallic surface when incident light has certain minimum

    A
    wavelength
    B
    frequency
    C
    amplitude
    D
    number of photons

  • Assertion (A) : Kinetic energy of photoelectrons emitted by a photosensitive surface depends upon the frequency of incident photon. Reason (R ): The ejection of electrons from metallic surface is possible with frequency of incident photon below the threshold frequency.

    A
    Both A and R are true and R is the correct explanation of A
    B
    Both A and R are true and R is NOT the correct explanation of A
    C
    A is true but R is false
    D
    A is false and R is true

  • The photoelectric effect is described as the ejection of electrons from the surface of a metal when

    A
    It is heated
    B
    It is placed in strong electric field
    C
    Electrons of suitable velocity
    D
    Light of suitable wavelength falls on it

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    Assertion : Kinetic energy of photo electrons emitted by a photosensitive surface depends upon the intensity of incident photon. Reason : The ejection of electrons from metallic surface is possible with frequency of incident photon below the threshold frequency.

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