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The frequency and the intensity of a bea...

The frequency and the intensity of a beam of light falling on the surface of a photoelectric material are increased by a factor of two. This will

A

increase the maximum kinetic energy, the photoelectrons, as well as photoelectric current by a factor of 2

B

increase the maximum kinetic energy of the photoelectrons and would increase the photoelectric current by a factor of 2

C

increase the maximum kinetic energy of the photoelectrons by a factor of 2 and will gave no effect on the magnitude of the photoelectric current produced

D

not produce any effect on the kinetic energy of the emitted electrins but will increase the photoelectric current by a factor of 2

Text Solution

Verified by Experts

The correct Answer is:
B
`((1)/(2)mv^(2))_(max)=hv-W`
When `upsilon` is doubled (W remains same), `((1)/(2)mv^(2))_(max)`
i.e., (KE) is increased. The photoelectric current is directly proportional to the intensity of incident light.
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Knowledge Check

  • The frequency and the intensity of incident beam of light falling on the surface of a photoelectric material is increased by a factor of two. This will

    A
    increase the maximum kinetic energy of the ejected photoelectrons by a factor of more than two and would increase the photoelectric current by a factor of two
    B
    increase the maximum kinetic energy of the photo electrons and would increase the photoelectric current both by a factor of two.
    C
    increase the maximum kinetic energy of the photoelectrons by a factor of two and will have no effect on the magnitude of the photoelectric current produced.
    D
    not produce any effect on the kinetic energy of the emitted photoelectrons but will increase the photoelectric current by a factor of two

  • On reducing the intensity of radiation falling on the surface of a material, the

    A
    number of ejected electrons will decrease.
    B
    energy of ejected electrons will decrease.
    C
    momentum of ejected electron will decrease.
    D
    velocity of ejected electrons will decrease.

  • By increasing the intensity of incident light on the surface of a metal

    A
    K.E. of photoelectrons increases
    B
    number of emitted electrons increases
    C
    kinetic energy and number of electrons increases
    D
    no effect

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    A : On increasing the intensity of light , the number of photoelectrons emitted is more . Also the kinetic energy of each photo increases but the photoelectric current is constant R : Photoelectric current is independent of intensity but increases with increasing frequency incident radiation

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