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A : Every metal has a definite work fun...

A : Every metal has a definite work function , still all photoelectrons do not come out with the same energy it incident radiation is monochromatic .
R : Work function is the minimum energy required for the electron in the highest level of conduction band to get out of the metal . Not all electrons in the metal belong to this level rather they occupy a continuous band of levels .

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

If Assertion is true statement but Reason is false , then mark (3)

D

If both Assertion and Reason are false statements , then mark (4) .

Text Solution

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A
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Every metal has a definite work function. Why do all photoelectrons not come out with the same energy if incident radiatio is monochromatic ? Why is there an energy distribution of photoelectrons ?

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Knowledge Check

  • Work function of a metal is minimum energy required to

    A
    free an electron from surface against coulomb's forces.
    B
    free a nucleon.
    C
    eject an electron electronic orbit.
    D
    ionize an atom.

  • Photoelectrons from metal do not come out with same energy . Most appropriate explanation is

    A
    Some electrons of a metal is average energy required to pull out electrons
    B
    Electrons in metal occupy different energy
    C
    Electrons in metal occupy different energy levels and work function is the minimum energy required for electron in highest level of conduction band to get out of metal
    D
    For some electrons, some part of energy gained during inelastic collision with photon is spent in over coming attractive force by nucleus

  • The work function of a metal is 3.4 eV. If the frequency of incident radiation is increased to twice, then the work function of the metal becomes.

    A
    3.4 eV
    B
    7.2 eV
    C
    6.8 eV
    D
    1.7 eV

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    The minimum energy required to eject electrons from the surface of a metal is called.....or.......

    The minimum energy required to ejected an electron from the surface of a metal is called............ .

    Photons of energy 6 eV are incident on a metal surface whose work function is 4 eV . The minimum kinetic energy of the emitted photo - electrons will be

    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 .

    When the energy of the incident radiation is increased by 20 % , kinetic energy of the photoelectrons emitted from a metal surface increased from 0.5 eV to 0.8 eV . The work function of the metal is

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