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In Lenard’s experiment for photo electric effect Nickel surface is irradiated by ultraviolet light of 200nm. Work function of Ni is 5eV. If the collector is given +5V w.r.t. to the emitter (Ni) then the range of kinetic energy of electrons on reaching the collector will be

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0 to 1.2eV

0 to 6.2eV

5 eV to 6.2eV

0 to 3.8 eV

answer is C.

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Detailed Solution

$K E_{\max} = (\frac{1240}{200} - 5) e V = 1.2 e V$

$\Rightarrow$ Range of photoelectron (5eV – 6.2 eV)

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