Electron moves from n =3 to n=2  a) calculate change in energy of the electron in joules  b) calculate the frequency of radiation that would be released

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A: We know the de Broglie wavelength is given as:λ=ph​=mvh​orv=mλh​orv2=m2λ2h2​or K.E.=21​mv2=2mλ2h2​

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de Broglie Equation

The sketch of matter waves is drawn below: