If the maximum kinetic energy of emitted photo electrons from a metal surface of work function 2.5 eV , is 1.7 eV . If wavelength of incident radiation is halved, then stopping potential will be

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Energy of incident photons, ​ h v = ϕ 0 ​ + K m a x ​ = 2.5 + 1.7 = 4.2 eV ∵ v λ = c and v ′ 2 λ ​ = c ⇒ v ′ = 2 v ​ According to Einstein's photoelectric equation, e V 0 ​ ​ = h v ′ − ϕ 0 ​ = h ( 2 v ) − ϕ 0 ​ = 2 × 4.2 − 1.7 = 6.7 eV ⇒ V 0 ​ = 6.7 V ​

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