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Which of the following techniques do not enhance sensitivity by a factor of 10 at normal operating conditions?

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Which of the following techniques do not enhance sensitivity by a factor of 10 at normal operating conditions?

(a) Optimization of sample volume

(b) Optimization of instrumental parameters

(c) Optimization of noise

(d) Time averaging

I have been asked this question in an interview for internship.

I'd like to ask this question from Sensivity Enhancement for NMR Spectroscopy topic in division Nuclear Magnetic Resonance Spectrometer of Analytical Instrumentation

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Right option is (d) Time averaging

Explanation: Time averaging techniques does not enhance sensitivity by a factor of 10. The other two techniques enhance sensitivity by a factor of 10 at normal operating conditions.

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