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Q.

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 emiter (Ni) then the range of kinetic energy of electrons on reaching the collector will be

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a

0 to 1.2eV

b

0 to 6.2eV

c

0 to 3.8eV

d

5eV to 6.2eV

answer is C.

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Detailed Solution

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eV0=1240200−5eV=1.2eV

KErange =(0+5)eV to (5+1.2)eV

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