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Q.

In Lenard’s experiment for photo electric effect Nickel surface is irradiated by ultraviolet light of $200 n m$ . Work function of $N i$ is $5 e V$ . If the collector is given $+ 5 V$ w.r.t. to the emiter $(N i)$ then the range of kinetic energy of electrons on reaching the collector will be

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a

$0 to 1.2 e V$

b

$0 to 6.2 e V$

c

$0 to 3.8 e V$

d

$5 e V to 6.2 e V$

answer is C.

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Detailed Solution

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$e V_{0} = (\frac{1240}{200} - 5) e V = 1.2 e V$

$K E_{range} = (0 + 5) e V to (5 + 1.2) e V$

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