Discussion
Which cycle allows a halogen bulb to run hotter than a plain filament lamp?
Answer: B
Evaporated tungsten combines with the halogen and redeposits on the filament rather than blackening the glass. A vacuum genuinely does prevent oxidation, which makes the last option a real property of the older lamp it replaced. The shared behaviour explains why these belong together and the differences explain why both exist. Reading the definition literally, rather than recalling a summary, avoids the usual confusion. Framing the question as which quantity the change acts upon makes the answer follow without calculation.
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