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Which of the following is the operating frequency of the ESR spectrometer?

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Which of the following is the operating frequency of the ESR spectrometer?

(a) 1.7 to 3.4 GHz

(b) 1.5 to 4.2 GHz

(c) 3.2 to 5.4 GHz

(d) 8.8 to 9.6 GHz

I got this question in class test.

My question is taken from Basic ESR Spectrometer topic in section Electron Spin Resonance Spectrometers of Analytical Instrumentation

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Correct answer is (d) 8.8 to 9.6 GHz

Best explanation: The operating frequency of the ESR spectrometer is 8.8 to 9.6 GHz. It is an important parameter.

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