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19/09/2020 3:34 pm
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A beam of electrons of energy E scatters from a target having atomic spacing of 1Å. The first maximum intensity occurs at θ = 60º. Then E (in eV) is……..
(Plank constant h = 6.64 × 10–34 Js, 1 eV = 1.6 × 10–19 J, electron mass m = 9.1 × 10–31 kg).
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19/09/2020 3:39 pm
2d sinθ = nλ
2d√3/2 = (1)λ
d = 1A
λ = √3 Å
√3 = √150/v
V = 50 volt
E = 50 eV