IIT JEE , AIEEE Forum - Physics , Modern Physics

nasa_hs

The kineticenergies of photoelectrons emitted from the metal are K₁ & K₂when it is irradiated with lights of wavelenghts $\lambda$ ₁ & $\lambda$ ₂ The workfunction of the matal is

K₁ $\lambda$ ₁ - K₂ $\lambda$ ₂/ $\lambda$ ₁- $\lambda$ ₂

K₁ $\lambda$ ₁ + K₂ $\lambda$ ₂/ $\lambda$ ₁+ $\lambda$ ₂

K₁ $\lambda$ ₂ - K₂ $\lambda$ ₁/ $\lambda$ ₂- $\lambda$ ₁

K₁ $\lambda$ ₂ + K₂ $\lambda$ 1/ $\lambda$ ₂+ $\lambda$ ₁

ans is a

ashish_banga

hc/ lambda1 = W + K1.......................1
hc/lambda2 = W + K2.........................2
replace the value of hc from 2 to 1 and then find W
it is A

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