1.

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

Answer»

SOLUTION :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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