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Calculate the frequency and wavelength of photon whose energy is 75eV.
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written 6.0 years ago by
teamques10
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Given Data :- $E = 75eV = 75×1.6×10^{(-19)} = 1.20 ×10^{(-17)}$
Formula :- $ E= 1/2 mv^2 , λ=h/mv= h/p$
Calculations :- $ E= 1/2 (mv^2) = ((mv)^2)/2m = h^2/(2mλ^2 )$
$λ = h/(√2mE) = (6.63 × 10^{(-34)})/(√2×9.1×10^{(-31)}×1.20×10^{(-17)} ) = 1.41 A°$
wavelength = 1.41 A°
frequency =$ 1/λ = 7.048 ×10^9$
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