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Which of the following is not an operating technique for sensitivity enhancement?

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Which of the following is not an operating technique for sensitivity enhancement?

(a) Optimization of sample volume

(b) Optimization of instrumental parameters

(c) Optimization of noise

(d) Time averaging

I had been asked this question in an interview for job.

The origin of the question is Sensivity Enhancement for NMR Spectroscopy in chapter Nuclear Magnetic Resonance Spectrometer of Analytical Instrumentation

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The correct answer is (c) Optimization of noise

To elaborate: There are only three operating techniques for sensitivity enhancement. Optimization of noise is not an operating technique for sensitivity enhancement.

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