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Questions  

Energy levels A, B, C of a certain atom corresponding to increasing values of energy i.e. EA<EB<EC. If λ1,λ2,λ3 the wavelengths of radiations corresponding to the
transitions C to B, B to A and C to A, respectively, which of the following statements is correct

a
λ3=λ1+λ2
b
λ3=λ1λ2λ1+λ2
c
λ1+λ2+λ3=0
d
λ32=λ12+λ22

detailed solution

Correct option is B

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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