Radiation differs from conduction and convection because radiation
ARequires no medium and travels through vacuum
BRequires a solid medium to travel through it
CNeeds both solid and liquid media to pass
DCannot travel through a gas like air
Answer & Solution
Correct answer: A. Requires no medium and travels through vacuum
1. Radiation is heat carried by electromagnetic waves.
2. It does not need particles to move energy along.
3. Heat from the Sun reaches Earth through space (vacuum).
4. So radiation needs no medium.
_Source: Selina Concise Physics Class 8, Ch 5 Heat (Mistral OCR'd PDF), section on radiation_
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