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According to the Bohr model, the energy of the hydrogen atom is given by the equation:...

According to the Bohr model, the energy of the hydrogen atom is given by the equation: E = (-21.7 x 10 -19 J)/ n 2 Calculate the wavelength of the photon emitted when the atom undergoes relaxation from the first excited state to the ground state

The answer is 1.22 x 10-7 m but I don't know how ?

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