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In a thermos flask, heat loss by radiation is minimizes by the

Physics
WAEC 2010

In a thermos flask, heat loss by radiation is minimizes by the

  • A. silvered surfaces
  • B. vacuum within the doubled walls
  • C. plastic stopper
  • D. cork support
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Correct Answer: Option A
Explanation

The silvered wall prevents heat loss by radiation. Silver is a poor radiator, and any heat from one wall tends to be reflected back by the other.

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