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By introducing which of the following, signal-to-noise ratio can be improved?

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By introducing which of the following, signal-to-noise ratio can be improved?

(a) Small amplitude field modulation

(b) Large amplitude field modulation

(c) Small amplitude field attenuation

(d) Large amplitude field attenuation

This question was addressed to me in exam.

The above asked question is from Basic ESR Spectrometer topic in portion Electron Spin Resonance Spectrometers of Analytical Instrumentation

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The correct option is (a) Small amplitude field modulation

Easy explanation: By introducing small amplitude field modulation, signal-to-noise ratio can be improved. This is because the previous DC measurement is too noisy.

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