Ejection of the photoelectron from metal in the photoelectric effect experiment can be stopped by applying 0.5 V when the radiation of 250 nm is used, The work function of the metal is

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4.5eV

5.5eV

5eV

4eV

answer is B.

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Detailed Solution

From Einstein's Photoelectric Equation,

$E = W_{o} + K E K E = E - W_{o} a l s o K E = e V_{o} e V_{o} = \frac{h c}{λ} - W_{o} W_{o} = \frac{h c}{λ} - e V_{o} o n p l u g g i n g t h e v a l u e s W_{o} = \frac{6.626 \times 10^{- 34} \times 3 \times 10^{8}}{2.5 \times 10^{- 7}} - (1.6 \times 10^{- 19} \times 0.5) W_{o} = 4.5 A^{o}$

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