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Physics · May / June 2026 · Paper 11 · Question 20

5054Radiation

The tubes inside solar heating panels use the Sun's radiation to warm water. Why are the tubes painted black?

  1. ABlack surfaces absorb radiation well.
  2. BBlack surfaces conduct heat well.
  3. CBlack surfaces emit radiation well.
  4. DBlack surfaces reflect radiation well.

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Correct answer: A. Black surfaces absorb radiation well.

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