NEETPhysicsAtoms and NucleiMCQ+4 / −1
Some energy levels of a molecule are shown in the figure with their wavelengths of transitions. Then :
- A
- B
- C
- D
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Correct answer: D
$$\begin{aligned} & h \frac{c}{\lambda_1}=\frac{-5 E}{2}+4 E=\frac{3}{2} E \quad \text{.... (1)}\\ & h \frac{c}{\lambda_2}=-2 E+3 E=E \quad \text{.... (2)}\\ & h \frac{c}{\lambda_3}=-2 E+4 E=2 E \quad \text{.... (3)} \end{aligned}$$
Comparing (2) and (3)
$$\frac{1}{\lambda_3}=\frac{2}{\lambda_2} \quad \lambda_2=2 \lambda_3$$
Comparing (1) and (2)
$$3 \lambda_1=2 \lambda_2 \quad \lambda_1<\lambda_2$$
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