Find the frequency and energy of a proton emitted as a result of the principle energy level n=3 to n=2. Please help!!=)

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by Pinkpantherkat at February 26, 2011

In a hydrogen atom, an excited electron transitions from the principle energy level n=3 to the principle enegery level n=2. What are the frequency and energy of a proton emitted as a result of this transition?

Please explain if you can, and thank you soo much!!=)