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Q.

The wavelength of the electron emitted by a metal sheet of work function 5 e V when photons from EMR of wavelength 62 nm strike the metal plate

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a

$3.16 nm$

b

$0.316 nm$

c

$826.67 A$

d

$82.667 A$

answer is C.

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Detailed Solution

$\begin{aligned} E_{incident} = \frac{1240}{62} = 20 eV \\ K E = 20 - 5 = 15 eV \\ λ = \sqrt{\frac{150}{15}} = \sqrt{10} Å \end{aligned}$

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