Discussion
Which envelope material does a halogen bulb use?
Answer: D
Quartz tolerates the temperature and pressure the halogen cycle requires. Ultraviolet blocking coatings or doped quartz genuinely are used because quartz transmits ultraviolet, which makes the last option a real feature of many lamps. Reading the definition literally, rather than recalling a summary, avoids the usual confusion. Naming what changes and what stays the same is the reliable route through questions of this shape. Framing the question as which quantity the change acts upon makes the answer follow without calculation.
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