4. A proton and an electron recombine to form atomic hydrogen in its 4pstate. At what wavelengths will recombination lines be observed? Label eachwavelength by its standard series notation. How would the observedemissions differ if the atoms had recombined to the 4s level?(This means that the initial state is the 4p state. Determine all possibletransition where a photon is emitted after the formation of the 4p stateincluding cascading transitions. Apply selection rules)

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Answered: 4. A proton and an electron recombine…

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