QJEEM17Phefd0: JEE Main 2017 Physics - Class 12 JEEM17Phefd0 Solution: Some energy levels of a molecule are shown in the figure. The…

Question

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Some energy levels of a molecule are shown in the figure. The ratio of the wavelengths r =

λ_{1}

/

λ_{2}

, is given by:

JEE Main 2017 (Offline) Physics - Atoms and Nuclei Question 212 English

Accepted Answer

From energy level diagram, using

Δ E = \frac{h c}{λ}

For wavelength

λ_{1}

,

Δ E =

–E – (–2E) =

\frac{h c}{λ_{1}}

For wavelength

λ_{2}

,

Δ E =

–E – (–

\frac{4 E}{3}

) =

\frac{h c}{λ_{2}}

∴

r =

\frac{λ_{1}}{λ_{2}} = \frac{(\frac{4 E}{3} - E)}{(2 E - E)}

=

\frac{1}{3}

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