O-LevelPhysicsThermal Physics5054/11 · May/June 2015 · Q161 Mark
The tubes inside solar heating panels use the Sun's radiation to warm water. Why are the tubes painted black?
ABlack surfaces absorb radiation well.
BBlack surfaces conduct heat well.
CBlack surfaces emit radiation well.
DBlack surfaces reflect radiation well.
✓ Correct answer
A: Black surfaces absorb radiation well.
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