Questions
The work function of a metal is 6.4x10-19J. If the metal is irradiated with radiation of wavelength 200nm,then the maximum K.E of the photoelectrons would be about
detailed solution
Correct option is B
Given, λ=200nm =200×10-9m E=hCλ=6.6×10-34×3×1082×10-7=9.9×10-19J Work function,W=6.4×10-19J According to photoelectric effect, E=W+K.E K.E=9.9×10-19-6.4×10-19=3.5×10-19JSimilar Questions
In a Photo electric effect experiment, A metal ‘X’ is irradiated by two incident radiations in two different experiments. If the ratio of incident frequencies is 1:2 and the ratio of kinetic energy of photo electrons is 1:3. Then the correct relation is (where are incident frequencies in experiment one and two respectively and is the threshold frequency of the metal ‘X’)
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