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The energy of the electron in the ground...

The energy of the electron in the ground state of H-atom is `-13.6 eV`. The energy of the first excited state will be

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The correct Answer is:
`-3.4 eV `
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  9. Find the energy of electron in 4th shell of Li^(2+) ion.

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  12. Write short note on : Absorbtion and emission spectrum.

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  14. Calculate the mass of the photon with wavelength of 5 pm.

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