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Class 12
PHYSICS
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) .

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Text Solution

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The correct Answer is:
A
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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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