Fast food restaurants keep food hot with infrared lamps. the heat is transferred to the food by
a. condensation
c. convection
b. conduction
d. radiation

Fast food restaurants keep food hot with infrared lamps. The heat is transferred to the food by d. radiation.
There is convection in between the heat source, but the heat is still radiated.
Radiation is the transfer of pure energy, unlike convection and conduction which are basically molecule to molecule contact.

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