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A photon of energy hv is absorbed by a f...

A photon of energy hv is absorbed by a free electron of a metal having work- function `phi lt hv`. Choose the correct option(s).

A

Number of electrons coming out depends on magnitude of v .

B

The electron is sure to come out with a kinetic energy `hv - phi`

C

Either the electron does not come out or it comes out with a kinetic energy `hv - phi`

D

It may come out with a kinetic energy less than and equal to `hv - phi`

Text Solution

Verified by Experts

The correct Answer is:
D
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Knowledge Check

  • A phot of energy h upsilon is absorbed by a free electron of a metal having work function phi lt h upsilon

    A
    The electron is sure to come out
    B
    The electron is sure to come out with a K.E. `=h upsilon - phi`
    C
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    D
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  • A when a photon of energy hv is incidnet on an electron in a metal of work function phi ( lt hv) , the electron will not necesserily come out of the metal . R : work function is the minimum energy required to liberate an electron out of a metal . So some electons may require more energy for their liberation .

    A
    If both Assertion & Reason are ture and the reason is the correct explanation of the assertion , then mark (1) .
    B
    If both Assertion & Reason are true but the reason is not the correct explanation of the assertion , then mark (2) .
    C
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  • A photon of energy 7 eV is incident on a metal surface having the work function of 3.75 eV. What is the stopping potential ?

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    B
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