Temperature Balances Flashcards
All 7 cards in this deck
(HT) What is true about the rates of absorption and emission for a body at constant temperature?
It is absorbing radiation at the same rate as it is emitting radiation.
(HT) When does the temperature of a body increase, in terms of radiation?
When the body absorbs radiation faster than it emits radiation.
(HT) When does the temperature of a body decrease, in terms of radiation?
When the body emits radiation faster than it absorbs radiation.
True or false? A body at constant temperature has stopped emitting radiation.
False. It still emits radiation, but absorbs it at exactly the same rate.
(HT) Name three factors that determine the temperature of the Earth.
The rate of absorption of radiation, the rate of emission of radiation, and the reflection of radiation into space.
(HT) What happens to the Earth's temperature if the rate at which the atmosphere and surface emit radiation into space decreases?
The temperature rises, because absorption is then faster than emission.
(HT) What are the steps to explain the temperature change of a body from a radiation diagram?
e.g. a road absorbing sunlight in the daytime
- State the rate of radiation absorbed: the road absorbs radiation from the Sun quickly.
- State the rate of radiation emitted: it emits infrared more slowly than it absorbs.
- Compare the rates to give the change: absorption > emission, so the road's temperature rises.