Answer :
Final answer:
The radiator of a motor car is primarily cooled by convection, which is the transfer of heat from the coolant to the moving air. While conduction also plays a slight role, convection is the dominant cooling mechanism. Thus, the correct answer is Option B: convection.
Explanation:
Cooling Mechanism of Car Radiators
The radiator of a motor car is primarily cooled by convection. This process involves the transfer of heat from the hot coolant circulating through the radiator to the air that passes through it.
Here's how it works:
- The engine heats the coolant.
- The heated coolant flows into the radiator.
- As air passes over the radiator fins, it absorbs heat from the coolant, effectively cooling it.
- The cooled coolant then circulates back to the engine.
In addition to convection, there can also be contributions from conduction when the coolant interacts with the radiator material, but the dominant cooling process in this scenario is convection. Thus, the correct answer to the question is Option B: convection.
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