题目内容

Thermodynamic considerations show that an ideal thermal radiator, or blackbody, will emit energy at a rate proportional to the fifth power of the absolute temperature of the body and directly proportional to its surface area.()

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Heat can be transferred through regions where a perfect vacuum exists.()

Latent heat______

Differential form______

When a system in a given initial state experiences a series of processes and returns to the initial state, the system undergoes a _______.

A. system
B. surrounding
C. process
D. cycle

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