A) Heat transfer by conduction and convection require a material medium.
B) Heat transfer by radiation doesn't require a material medium.
both A and B are true
A is true but B is false
B is true but A is false
both A and B are false
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Correct option is A)
Conduction and convection are processes where heat is transferred by the collision of molecules. Hence, for these processes to take place, we need a material medium. In radiation, heat travels as electromagnetic waves which do not require a medium to travel. Its transfer mechanism is completely independent of the medium.
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