O-LevelPhysicsThermal Physics5054/11 · May/June 2016 · Q181 Mark
Which statement about thermal radiation is correct?
AIn a vacuum, thermal radiation travels at the speed of light.
BThermal radiation is a longitudinal wave.
CThermal radiation travels as an ultra-violet wave.
DWhite surfaces are better emitters of thermal radiation than black surfaces.
✓ Correct answer
A: In a vacuum, thermal radiation travels at the speed of light.
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