Electromagnetic radiation of wavelength 77.9 nm was projected on a gallium plate with a 6.86×10-19 J...
Electromagnetic radiation of wavelength 77.9 nm was projected on a gallium plate with a 6.86×10-19 J of work function. Calculate the kinetic energy of an emitted electron.
Homework Answers
energy of the radiation (E) = hc/
, h is planck's
constant, c is speed of light and is
wavelength
E = 6.625 * 10-34 * 3 * 108 / (77.9 * 10-9) = 2.55 * 10-18 J
We know that : K.E = E - Work function = 2.55 * 10-18 - 6.86 * 10-19 = (25.5 - 6.86) * 10-19 J = 1.864 * 10-18 J
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