Energy levels A, B, C of a certain atom corresponding to increasing values of energy i.e. EA

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λ3=λ1+λ2

λ3=λ1λ2λ1+λ2

λ1+λ2+λ3=0

λ32=λ12+λ22

answer is B.

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Detailed Solution

Let the energy in A, B and C state be EA, EB and EC, then from the figureEC−EB+EB−EA=EC−EA ⇒hcλ1+hcλ2=hcλ3 ⇒λ3=λ1λ2λ1+λ2

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