alleryAn atomic gas is usually excited by passing through it an electric:
ACharge
BField
CSignal
DCurrent
Answer & Solution
Correct answer: D. Current
1. The gas is held at low pressure in a tube.
2. Energy must be supplied to make it emit.
3. An electric current is passed through it.
_Source: syllabus Physics Part II, Chapter 12, Atoms._
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