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Work function of Sodium is 2.75 eV. What...

Work function of Sodium is 2.75 eV. What will be K.E. of emitted electron when photon of energy 3.54 eV is incident on the surface of sodium ?

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Maximum K.E. of emitted photoelectron `=(3.54-2.75)eV=0.79eV.`
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Knowledge Check

  • When light of energy 2.5 eV falls on a metal surface, the maximum K.E. of the emitted electrons is T. If the radiation of energy 4eV is made incident on the same metal surface, the K.E. of the electrons is doubled. What is the work function of the metal ?

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    D
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  • The photoelectric work function of a surface is 2.2 eV. The maximum kinetic energy of photoelectrons emitted when light of wavelength 6200 Å is incident on the surface, is

    A
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    B
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    D
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  • The work function of tungsten is 4.50 eV . The wavelength of fastest electron emitted when light whose photon energy is 5.50 eV falls on tungsten surface, is

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    C
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    D
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