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Question
Which of the following properties is shared by both thermal radiation and visible light?
Options
They require a medium for propagation
They travel at the speed of sound in air
They are both forms of electromagnetic waves travelling in straight lines
They can only be emitted by black-coloured surfaces
MCQ
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Solution
They are both forms of electromagnetic waves travelling in straight lines
Explanation:
Thermal radiation travels as electromagnetic (EM) waves in straight lines at the speed of light, exactly like visible light. Both are part of the electromagnetic spectrum and do not require a medium, which is why the Sun's heat can reach Earth across the vacuum of space.
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