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The energy of an electron in an excited ...

The energy of an electron in an excited hydrogen atom is `-3.4 eV`. Calculate the angular momentum of the electron according to Bohr's theory.
(Given Rydberg's constant `R=1.09737 xx 10^-7 m^-1, h=6.626176 xx 10^-34 Js, c=3 xx 10^8 ms^-1)`.

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