The work function of sodium metal is 4 . 41 × 10 - 19 J . If photons of wavelength 300 nm are incident on the metal, the kinetics energy of the ejected electrons will be h = 6 . 63 × 10 - 34 J s ; c = 3 × 10 8 m s - 1 __________ × 10 - 21 J

Step-by-step solution

E = E 0 + ( kE ) max hC λ = 4 . 41 × 10 - 19 + kE 6 . 63 × 10 - 34 × 3 × 10 8 300 × 10 - 9 = 4 . 41 × 10 - 19 + kE So, KE max = 6 . 63 × 10 - 19 - 4 . 41 × 10 - 19 = 2 . 22 × 10 - 19 = 222 × 10 - 21 J