Two radiations of photon energies 1 eV and 2.5 eV , successively illuminate a photosensitive metallic surface of work function 0.5 eV . The ratio of the maximum speeds of the emitted electrons isNEET

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Two radiations of photon energies 1 eV and 2.5 eV , successively illuminate a photosensitive metallic surface of work function 0.5 eV . The ratio of the maximum speeds of the emitted electrons isNEET 2012 (Mains)

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We have 2 1 ​ m v m a x 2 ​ = E − ϕ Here case (i) 2 1 ​ m v 1 m a x 2 ​ = ( 1 − 0.5 ) eV 2 1 ​ m v 2 m a x 2 ​ = ( 2.5 − 0.5 ) eV ​ Hence, v 2 m a x 2 ​ v 1 m a x 2 ​ ​ = 4 1 ​ v 2 m a x ​ v 1 m a x ​ ​ = 2 1 ​

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