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The work function for a metal is 4 eV. To eject the photo electrons with zero velocity the wavelength of the incident light should be

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2700 $\overset{0}{A}$

1700 $\overset{0}{A}$

5900 $\overset{0}{A}$

3100 $\overset{0}{A}$

answer is D.

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Detailed Solution

Maximum wavelength to produce photoelectron

$\frac{12400}{4} = 3100 \overset{0}{A}$

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