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Which of the following is not a source of radiant energy?

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Which of the following is not a source of radiant energy?

(a) Tungsten-mercury lamp

(b) Tungsten lamp

(c) Xenon-mercury arc

(d) Deuterium discharge lamp

I got this question by my college director while I was bunking the class.

This interesting question is from Monitoring Labour Activity topic in section Foetal Monitoring Instruments of Biomedical Instrumentation

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Best answer
Right choice is (a) Tungsten-mercury lamp

The best explanation: Radiant just means energy that can move from one place to another without a medium to carry it. A source of radiant energy, which may be a tungsten lamp, a xenon-mercury arc, hydrogen or deuterium discharge lamp, etc.

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