The potential difference that must be applied to stop the fastest photoelectrons emitted by a nickel surface, having work function 5.01 eV , when ultraviolet light of 200 nm falls on it, must beNEET 2

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The potential difference that must be applied to stop the fastest photoelectrons emitted by a nickel surface, having work function 5.01 eV , when ultraviolet light of 200 nm falls on it, must beNEET 2010 (Screening)

TestHub · Accepted Answer

Energy of incident light E ( eV ) = 2000 12375 ​ = 6.2 eV ( 200 nm = 2000 A ˚ ) According to the relation E = W 0 ​ + eV 0 ​ ⇒ V 0 ​ ​ = e E − W 0 ​ ​ = e ( 6.2 − 5.01 ) e ​ = 1.2 V ​

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