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# When an electron jumps from n = 4 level to n = 1 level(ground state), the number of photons emitted is:

a) 1

b) 3

c) 4

d) 2

2. Relevant equations

3. The attempt at a solution

If the electron first moves from n = 4 to n = 3, then to n = 2 and then finally to n = 1 level then 3 photons are emitted. Similarly it can be 2 photons if the successive transitions are 4-->2-->1 or 4-->3-->1. It can be 1 if the transition is 4-->1. So are the suitable answers (a),(b) & (c)?

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# Number of photons emitted between transitions

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