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Calculate the wavelength in Angstroms ...

Calculate the wavelength in Angstroms of the photon that is emitted when an electron in the Bohr's orbit `n = 2`, returns to the orbit `n = 1`, in the hydrogen atom .The ionisation potential of the ground state hydrogen atom is `2.17 xx 10^(-11)` ergs per atom

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The correct Answer is:
`lamda=1220`Ã…
Energy of the electron in the 1st orbit=-(ionisation potential) `DeltaE=(3//4)xx2.17xx10^(-11)` erg per atom.
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