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Which of the following is adjusted as a fine control for frequency tuning?

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Which of the following is adjusted as a fine control for frequency tuning?

(a) Cathode

(b) Anode

(c) Reflector voltage

(d) Grid

This question was posed to me by my school principal while I was bunking the class.

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

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Best answer
The correct choice is (c) Reflector voltage

The explanation: Reflector voltage is adjusted as a fine control for frequency tuning. Distance is the coarse frequency adjustment.

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