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If suitable light is allowed to fall on a clean metal surface, electrons are emitted from the surface. This phenomenon is called the photo - electric effect. Usually a radiation in the UV region and also in some cases in the visible region produces such an effect. The velocity and K.E. of the emitted electrons are measured by electric field . If wavelength of 470 nm falls on the surface of potassium metals, electrons are emitted with a velocity of `6.4 xx 10^(4) m sec^(-1)`
Stopping potential of given circuit is ,

A

`1.86 xx 10^(-21) J`

B

`18.6 xx 10^(-25) J`

C

`1.86 xx 10^(-23) J`

D

`1.86 xx 10^(-20)`

Text Solution

Verified by Experts

The correct Answer is:
A
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Knowledge Check

  • If suitable light is allowed to fall on a clean metal surface, electrons are emitted from the surface. This phenomenon is called the photo - electric effect. Usually a radiation in the UV region and also in some cases in the visible region produces such an effect. The velocity and K.E. of the emitted electrons are measured by electric field . If wavelength of 470 nm falls on the surface of potassium metals, electrons are emitted with a velocity of 6.4 xx 10^(4) m sec^(-1) The work function of potassium metal is :

    A
    `4.2 xx 10^(-19) J`
    B
    `1.86 xx 10^(-21) J`
    C
    `4.25 xx 10^(-30)J`
    D
    `4.2 xx 10^(-18)J`

  • If suitable light is allowed to fall on a clean metal surface, electrons are emitted from the surface. This phenomenon is called the photo - electric effect. Usually a radiation in the UV region and also in some cases in the visible region produces such an effect. The velocity and K.E. of the emitted electrons are measured by electric field . If wavelength of 470 nm falls on the surface of potassium metals, electrons are emitted with a velocity of 6.4 xx 10^(4) m sec^(-1) If bombarded light frequency is twice, then K.E. of emitted electrons is :

    A
    `1.86 xx 10^(-21) J`
    B
    `4.24 xx 10^(-19) J`
    C
    `1.98 xx 10^(-22)J`
    D
    `4.25 xx 10^(-22)J`

  • The photo electrons emitted from the surface of sodium metal are

    A
    Of speeds from `0` to a certain maximum
    B
    Of same de Broglie wavelength
    C
    Of same kinetic energy
    D
    Of same frequency