The quantity that is unchanged at different magnetic field strengths is
Question and options
The quantity that is unchanged at different magnetic field strengths is
- Nuclear spin population in an energy state
- Energy difference between two energy states of nuclei with non-zero spin quantum number
- Coupling constant
- Chemical shift (in hertz)
Answer and explanation
Correct answer: C - Coupling constant
In NMR, the spin-spin coupling constant J (in Hz) arises from through-bond interactions and is independent of applied field strength; populations, energy gap, and chemical shift in Hz all scale with field.
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