A photon of wavelength 4x10 7m strikes a metal surface Whose work function is 3.412 x 10 -19 J.Calculate the energy of photon

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Solution

Total Energy of the photon = hc/λ = 6.625 x 10^-34 X 3 x 10⁸ / 4x10 ^-7m = 4.97 x 10^-19 J

Kinetic energy = total energy - work function

= 4.97 x 10^-19 J - 3.412 x 10 ^-19 J
= 1.558 x 10^-19J

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