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(a) If an electron makes a transition from the n = 4 Bohr orbit to the...

(a) If an electron makes a transition from the n = 4 Bohr orbit to the n = 2 orbit, determine the wavelength of the photon created in the process
. (b) Assuming that the atom was initial rest, determine the recoil speed of the hydrogen atom when this photon is emitted.

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