The work function of a metal is 4 eV. To eject a photoelectron of zero velocity from the surface of the metal, the wavelength of incident light should be approximately

Question

The work function of a metal is

4 eV

. To eject a photoelectron of zero velocity from the surface of the metal, the wavelength of incident light should be approximately

310 \overset{\circ}{A}

1550 \overset{\circ}{A}

155 \overset{\circ}{A}

3100 \overset{\circ}{A}

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