10 years of professional experience, Question 20.
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Which of the following statements about radiation heat transfer is incorrect? A. If the temperature difference of an object remains constant, the amount of radiation emitted also remains constant. B. The radiant energy of infrared light plays a decisive role in thermal radiation. C. Thermal rays obey the laws of reflection and refraction, and they travel in straight lines within homogeneous media. D. Thermal radiation cannot pass through most gases and liquids. How should one make a choice? I choose D. Please ask a fellow user to answer, thank you.
Choose AD. Option A should refer to a constant temperature, with no change in the heat radiation. D: In a vacuum and most gases (inert gases and symmetric diatomic gases), heat rays can pass through completely, but they cannot pass through most solids and liquids. Every year, there are a few exam questions that are controversial; this is probably why the association does not release the actual exam questions in a book. Otherwise, with this opportunity to make money, why not take it?
A. If the temperature difference of an object remains constant, then the amount of radiant heat also remains constant. Incorrect: Radiant heat is proportional to the fourth power of the temperature. B. The radiant energy of infrared light plays a decisive role in thermal radiation. Incorrect: Sunlight mainly consists of visible light. C. Thermal rays obey the laws of reflection and refraction, and they travel in straight lines within homogeneous media. Uncertain. D. Thermal radiation cannot pass through most gases and liquids. Incorrect: Thermal radiation can pass through gases
I think both AD are wrong; the ability to emit radiation depends only on the temperature of an object, not on the temperature difference between two objects. D radiation can pass through gases
. If the temperature difference of an object remains constant, then the amount of radiant heat also remains constant. Incorrect: Radiant heat is proportional to the fourth power of the temperature. B. The radiant energy of infrared light plays a decisive role in thermal radiation. Incorrect: Sunlight mainly consists of visible light. C. Thermal rays obey the laws of reflection and refraction, and they travel in straight lines within homogeneous media. Uncertain. D. Thermal radiation cannot pass through most gases and liquids. Incorrect; thermal radiation can pass through gases. If you’re not sure, don’t give your opinion; read the books carefully before speaking again. The controversy over this question lies between A and D