GK QUESTION#2936
Assertion (A): Heat from the Sun reaches the Earth even though space is a vacuum. Reason (R): Radiation does not require a medium for the transfer of heat.
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Answer
A. Both A and R are true, and R is the correct explanation of A.
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Explanation
Both the assertion and reason are true, and the reason explains the assertion. Electromagnetic radiation can carry solar energy through a vacuum. Conduction and convection require matter.