1.

Assertion (A) Radiation is the fatest mode of transmissin of heat Reason (R ) : Conduction and convection require a medium for transmission of heat where as heat radiations can travel through vaccum .

Answer»

both a and R are correct and r is the correct EXPLANATION of a
both a and r are correct but ra is not the correct explanation of a
a is correct and r is INCORRECT
both a and r are incorrect

Solution :RADIATION is the fastest mode of transmission of heatIt does not REQUIRE any medium as , it transmits heat in the form of electromageneitic waves .But conduction and convenction required a material medium for transmission of heat so A and R are correct but R is not the correct explanation of A


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