Q92 · CSIR NET Chemistry, June 2012
Paper: CSIR NET June 2012 · Subject: Physical Chemistry · Chapter: Statistical Thermodynamics · Topic: Partition Functions · Marks: 2 · Difficulty: Medium
The electric-dipole allowed transition among the following is
(a)${ }^{3} \mathrm{S} \rightarrow{ }^{3} \mathrm{D}$
(b)${ }^{3} \mathrm{S} \rightarrow{ }^{3} \mathrm{P}$
(c)${ }^{3} \mathrm{S} \rightarrow{ }^{1} \mathrm{D}$
(d)${ }^{3} \mathrm{S} \rightarrow{ }^{1} \mathrm{F}$
Answer
Answer: B ✓ checked by 4AB · confidence high
The source book printed D; on checking, B is correct — see the explanation.
Explanation
q = Σ e^{−nhν/kT} = 1/(1 − e^{−hν/kT}); with T = hν/k this is 1/(1 − 1/e).
Study loop for Statistical Thermodynamics