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The energy of the electron in the second...

The energy of the electron in the second and third Bohr's orbitals of the hydrogen atom is `-5.42 xx 10^(-12) erg` and `-2.42 xx 10^(-12) erg` respectively ,Calculate the wavelength of the emitted radiation when the electron drops from the third to the second orbit.

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The correct Answer is:
`660 nm`
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