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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