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Physics Modern Physics Level: High School

Bohr’s Atomic Model

The electron of a hydrogen atom is initially at the orbit n = 4 , If this electron first goes to the orbit n = 3 and then to the orbit n = 2 and then the orbit n =1 , how many photons are emitted during these transitions ? How many photons are emitted if the electron directly falls from the orbit n = 4 to the orbit n = 1 ?