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In frequency sweep method, which of the following parameters are varied continuously?

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In frequency sweep method, which of the following parameters are varied continuously?

(a) Magnetic field

(b) RF signal

(c) Sample concentration

(d) Amplification factor

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

The above asked question is from Continuous Wave NMR Spectroscopy topic in chapter Nuclear Magnetic Resonance Spectrometer of Analytical Instrumentation

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Correct option is (b) RF signal

Easy explanation: In frequency sweep method, magnetic field is held constant. RF signal is swept or varied continuously.

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