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If the population of ground state exceeds the population of the excited state a net absorption of __________ radiation takes place.

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If the population of ground state exceeds the population of the excited state a net absorption of __________ radiation takes place.

(a) Infrared

(b) Ultraviolet

(c) Microwave

(d) X-ray

The question was asked during an online interview.

My question is based upon Electron Spin Resonance topic in section Electron Spin Resonance Spectrometers of Analytical Instrumentation

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Correct option is (c) Microwave

Easiest explanation: If the population of ground state exceeds the population of the excited state a net absorption of microwave radiation takes place. The signal would be proportional to the population difference.

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