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At which of the following frequencies is the magnetic field at the sample modulated?

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At which of the following frequencies is the magnetic field at the sample modulated?

(a) 1 kHz

(b) 10 kHz

(c) 100 kHz

(d) 1000 kHz

I had been asked this question in exam.

Asked question is from Basic ESR Spectrometer in portion Electron Spin Resonance Spectrometers of Analytical Instrumentation

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Best answer
The correct answer is (c) 100 kHz

Easiest explanation: The magnetic field at the sample is modulated at 100 kHz. The magnetic field is kept at a maximum.

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