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Q.

The work function of sodium metal is $4.41 x 10^{- 19} J$ . If the photons of wavelength 300 nm are incident on the metal, the kinetic energy of the ejected electrons will be _____ $x 10^{- 21} J$

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a

$400$

b

$222$

c

$600$

d

$300$

answer is B.

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Detailed Solution

$\frac{h c}{λ} = E_{0} + K E$
$(\frac{6.63 x 10^{- 34} x 3 x 10^{8}}{300 x 10^{- 9}}) - 4.41 x 10^{- 19} = K E$
$K E = 222 x 10^{- 21} J$

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