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Calculate the frequency of the photon,wh...

Calculate the frequency of the photon,which can excite the electron to `-3.4 eV` from`-13.6 eV`.

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Energy of photon, `hupsilon = E_(2) - E_(1)`
Frequency, `upsilon = (E_(2) - E_(1))/(h)`
`= ([-3.4 - (-13.6)] xx 1.6 xx 10^(-19))/(6.6 xx 10^(-34))`
` = (10.2 xx 1.6 xx 10^(15))/(6.6)`
`upsilon = 2.47 xx 10^(15) Hz`
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