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 × 10–34Js; c = 3 × 108 m/

Question

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 × 10–34Js; c = 3 × 108 m/s) ______× 10–21 J.

Prashant Kotian · Accepted Answer

Correct answer: .. Metal (Work function = E0) kE E E = E0 + (kE)max  hC = 4.41 × 10–19 + kE 34 300 3 63 .       = 4.41 × 10–19 + kE So, (kE)max = 6.63 × 10–19 – 4.41 × 10–19 = 2.22 × 10–19 = 222 × 10–21J

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