K1 and K2 be the maximum kinetic energies of photoelectrons emitted from a surface of a given material for the light of wavelength λ1 and λ2, respectively. If λ1 = 2 λ2 then the work function of material is given by :
K2 + 2K1
2K2 − K1
K1 − 2K2
K2 − 2K1
Solving (i) & (ii), we get
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