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The maximum wavelength of a beam of light can be used to produce photo electric effect on a metal is 250 nm. The maximum kinetic energy of the electrons (in eV) emitted from the surface of the metal when a beam of light of wavelength 200 nm is used

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1.78

0.5

2.23

$1.24$

answer is D.

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Detailed Solution

$k E = \frac{h c}{λ} - \frac{h c}{λ_{0}}$

$= \frac{12, 400}{λ (i n \overset{o}{A})} - \frac{12, 400}{λ_{0} (i n \overset{o}{A})}$

$= \frac{12, 400}{2000} - \frac{12, 400}{2500}$

$= 6.2 - 4.96$

$= 1.24 e V$

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