Work function of the metal, ɸ0 = 4.2 eV = 4.2 x 1.6 x 10–19 J = 6.72 x10–19 J Wavelength of incident radiation, λ = 330 nm Now, using the formula for energy of a photon, E = hcλ⇒ E = 6.62 × 10-34 × 3 × 108330 × 10-9 = 6.018 × 10-19J As energy of incident photon E
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