A glass of hot tea was left in a large cool room. Over time, the temperature of the tea equaled the temperature of the surrounding air. How did the intensities of thermal radiation and thermal absorption of tea change?
The intensity of thermal radiation decreased, the intensity of thermal absorption remained virtually unchanged.
Tea, on the one hand, emits heat rays, on the other hand, absorbs the thermal radiation of the surrounding air. At first, the radiation process prevails and the tea cools. With decreasing temperature, the intensity of thermal radiation of tea decreases until it is equal to the intensity of absorption of thermal radiation from air in the room. Further, the temperature of the tea does not change.
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