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In Lenard’s experiment for photo-electric effect Nickel surface is irradiated by ultraviolet light of
200 nm. Work function of Ni is 5 eV. If the collector is given +5 V 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

5eV to 6.2eV

0 to 6.2eV

0 to 3.8eV

answer is C.

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Detailed Solution

$E = \frac{12400}{2000} = 6.2 e V$

W = 5eV

$K E_{\max} = E - W$

= 6.2 –5

= 1.2 eV

With anode +5V,

$K E_{\max} = (1.2 + 5) = 6.2 e V$

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