What wavelength photon is required to excite a hydrogen from the n=1 state to the n=3 state? what is the lowest frequency photon that will be observed?

Explanation:

It is given that,

Initial state of electron,

Final state of electron,

The wavelength of the excited electron is given by :

Where

R is Rydberg's constant

or

Let f is the frequency of the observed photon. It is given by :

Hence, this is the required solution.

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