Calculate the wavelength in Angstroms of the photon that is emitted when an electron is

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Calculate the wavelength in Angstroms of the photon that is emitted when an electron is Bohr orbit `n = 2` return 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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