Question: When the excited electron in a hydrogen atom falls from n = 5 to n = 2, a photon of blue light is emitted. If

When the excited electron in a hydrogen atom falls from n = 5 to n = 2, a photon of blue light is emitted. If an excited electron in He1 falls from n = 4, which energy level must it fall to so that a similar blue light (as with hydrogen) is emitted? Prove it.

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