A singly ionized helium atom is in the ground state. It absorbs energy and makes a transition to the n = 3 excited state. The ion returns to the ground state by emitting two photons. What are their wavelengths?
(lowest energy photon)
(highest energy photon)
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From the n = 3 excited state, the electron can make two transitions: it can make a transition to the n = 2 state and it can also make a transition to the n = 1 state.
To get the wavelengths of the emitted photons, we first have to get their frequencies. There are quite a number of ways to get the frequency but I will use the method I feel is quite simple.
The frequency of the radiated ...
This solution of 299 words calculates the wavelengths of the lowest energy photon and highest energy photon with step-by-step calculations and full explanations.