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Find quantum number that describes the engergy level

A)An electron in a hydrogen atom makes a transition from the n=3 energy stage to teh ground state (n=1). What is the frequency of the emitted photon?

B)Now the electron is excited from its ground state to its first excited state. Waht is the frequency of the absorbed photon?

C) While in the first excited state, the electrons recieves 1.888eV of energy. What is the quantum number n that describes the engergy level that the electron ends up at?

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