Q129 · CSIR NET Chemistry, June 2011
Paper: CSIR NET June 2011 · Subject: Physical Chemistry · Chapter: Molecular Spectroscopy · Topic: NMR ESR Physical · Marks: 2 · Difficulty: Medium
The uncertainty in the NMR frequency of a compound in liquid state (relaxation time $=1 \mathrm{s}$ ) is 0.1 Hz . The uncertainty in the frequency (in Hz) of same compound in solid state (relaxation time $=10^{-4} \mathrm{s}$ ) is
(a)10
(b)100
(c)1000
(d)$10^{-3}$
Answer
Answer: C ✓ checked by 4AB · confidence high
Explanation
Line width ∝ 1/T₂: shortening the relaxation time from 1 s to 10⁻⁴ s broadens the line 10⁴-fold, 0.1 Hz → 1000 Hz.
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