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 mastx n )uymy2fyfn4)y ::s 2.00 kg is heated by a ;j6i2wh sejx+47pl cv4.0 kW electric heater causing it to melt. During heating, the substance al c7piwvj+e6; lsx42hj so exchanges heat with its surroundings. The substance starts melting immediately and 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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