本题目来源于试卷: Physics Unit14: Heat，类别为 国际高中通用物理
[单选题]
In an electric furnacegu in3fa, cq.e8e9t i3 u h )mtwfe 4ux+ef2;jj 4azg8o2sed for refining steel, the temperature is monitored by measufe 2;)z 4ug+ h2jotjmfe aw4x8ring the radiant power emitted through a small hole of area $0.5 \; cm^{2}$. The furnace acts like a blackbody radiator. If it is to be maintained at a temperature of $1650 \; ^{\circ}C$, at what level should the power radiated through the hole be maintained?
A. $20 \; W$
B. $30 \; W$
C. $40 \; W$
D. $50 \; W$
参考答案: C
本题详细解析:
暂无
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