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  4. Assertion Like light radiation, thermal radiations are also electromagnetic radiation. Reason The thermal radiations require no medium for propagation.

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Q. Assertion Like light radiation, thermal radiations are also electromagnetic radiation.
Reason The thermal radiations require no medium for propagation.

AIIMSAIIMS 2010

Solution:

Light radiations and thermal radiations both belong to electromagnetic spectrum. Light radiation belongs to visible while thermal radiation belongs to infrared region of $EM$ spectrum.
Also $EM$ radiations require no medium for propagation.