本题目来源于试卷: Particulate Nature of Matter B.1 Thermal Energy Transfers，类别为 IB物理学
[单选题]
A substance, initially solid of mass 2.00b6pscferg zy2+:51 -o ni :oyc kgqy8-hoh;6 iax is heated by a 4.0 kW electric heater causing it to melt. During heating, the substance also exchanges heat with its surroundings. The substance starts melting immediately ;-qxhhyo8a 6 iand has fully turned to liquid after 400 s. Given that the specific latent heat of fusion of the solid is $900\,kJkg^{−1}$, what is the average rate of heat transfer between the substance and the surroundings in one second?
A. Direction of heat transfer is from the surroundings ; Rate of heat transfer is 500 W
B. Direction of heat transfer is to the surroundings ; Rate of heat transfer is 500 W
C. Direction of heat transfer is from the surroundings ; Rate of heat transfer is 1750 W
D. Direction of heat transfer is to the surroundings ; Rate of heat transfer is 1750 W
参考答案: A
本题详细解析:
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