Q.

is not a source of radiant energy.

A. Tungsten-mercury lamp
B. Tungsten lamp
C. Xenon-mercury arc
D. Deuterium discharge lamp
Answer» A. Tungsten-mercury lamp
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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