In which transition is one quantum of energy | vedclass

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(D) According to Planck's quantum theory,the emission or absorption of energy occurs in the form of discrete packets called quanta. When an electron t

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(D) According to Planck's quantum theory,the emission or absorption of energy occurs in the form of discrete packets called quanta. When an electron transitions from a higher energy level $(n_{high})$ to a lower energy level $(n_{low})$,it emits energy in the form of a photon (quantum). Since all the given transitions ($n = 4 \rightarrow n = 2$,$n = 3 \rightarrow n = 1$,and $n = 5 \rightarrow n = 3$) involve an electron moving from a higher energy state to a lower energy state,each transition results in the emission of one quantum of energy.

In which transition is one quantum of energy emitted?

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