Q.

In a photoemissive cell with exciting wavelength λ , the fastest electron has speed v. If the exciting wavelength is changed to  , the speed of the fastest emitted electron will be

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a

b

c

d

Greater than

answer is D.

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Detailed Solution

When wavelength is λ  and velocity is v, then ........(i)When wavelength is   and velocity is v’ then .......(ii)Divide equation (ii) by (i), we get
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