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Calculate the frequency and wavelength of photon whose energy is 75eV .
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Given Data:- :- E=75eV=75×1.6×10(19)=1.20×10(17)

Formula :- E=12mv2,λ=hmv=hp

Calculations :- E=mv22m=(mv)22m=h22mλ2

λ=h2mE=6.63103429.110311.201017=1.41Ao

Wavelength = 1.41Ao

frequency = 1λ=7.048109

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