PHYSICS 20E Study Guide - Final Guide: Thermostat, Ozone Layer, Mitochondrion
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Energy absorbed = energy radiated: anything with a temperature shines with a process called black body radiation. b. i. Hot coals, lava, sun, stars, planets, me b. ii. A perfect black body radiator does not reflect any light. b. iii. Objects at 37c (98. 6 f) glow in ir light heat . b. iv. Objects at 6000 c (surface of the sun) glow in visible light: the earth is in equilibrium: energy absorbed = energy radiated c. i. If not, the earth would get hotter and hotter and burst into flames: the greenhouse effect: d. i. Sunlight (visible light) absorbed by the earth"s surface warms it up. d. ii. The warm surface emits infrared light, which is trapped by the atmosphere. d. ii. 1. Makes earth about 33 c warmer than it would be without atmosphere. d. iii. Greenhouse gases gases transparent to visible light, but absorbed by infrared light. d. iii. 1. Carbon dioxide (co2), methane (ch4), water vapor (h20) d. iii. 2. Greenhouse gases act like a blanket for the earth. d. iii. 4.
