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Answer :
Final answer:
In a convection oven, heat transfer occurs predominantly through convection, with the circulation of hot air cooking the food. In a fireplace, the primary mode of heat transfer is radiation, with the fire radiating heat outward, though conduction and convection also play a role. Thus, the answer is b) Convection; radiation.
Explanation:
Comparing the movement of heat in a convection oven and a fireplace, we need to consider the different types of heat transfer occurring in these systems. In a convection oven, heat is distributed via convection, which is the heat transfer by the macroscopic movement of a fluid (in this case, air). This is when hot air rises because it is less dense and is replaced by cooler air, creating a circulation pattern that transfers heat to the food being cooked.
In a fireplace, radiation is primarily responsible for the heat transfer into the room. Heat radiates outward in all directions from the fire. Some heat is also transferred through conduction, as the heat from the fire comes into direct contact with other materials, such as the hearth or walls, which may then conduct heat into the room. Additionally, convection occurs as cold air enters around windows and hot air exits up the chimney.
Therefore, the correct answer to the question is b) Convection; radiation, as the predominant form of heat transfer in a convection oven is convection, and in a fireplace, it is radiation. Examples from daily life for each mechanism of heat transfer include heating a pan on a stove for conduction, the circulation of air in a weather system for convection, and the warmth of the sun on Earth for radiation.
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