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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 x 10-11 erg per atom.

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Given that : Energy of the electron in first Bohr's orbit (E1) = 2.17 x 10-11

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