E200 1/23

Question	Answer
What is Heat	energy transferred spontaneously from a hotter body to a colder body
How is heat transferred	conduction(solids) convection(liquids and gases) and by radiation
Watt	1J/sec 60watts emits 60 joules of energy / second
Joule	heat required to raise temp of 1g of water by .24C
How much energy/m^2 does sun emit	340W/m^2 takes 20min to boil 1L from ice
How does earth lose energy	emits infrared radiation
What wavelengths are emitted by sun	UV and some other ones look on slides
K	C + 273.15
Wein's law	warmer bodies give of radiation at shorter wavelengths than cooler peak wavelength = 2900/T T= temp in K
temp of sun	5800K
Stephen-Boltzmann Law	Warmer bodies give off more energy than cooler bodies W/m^-2 = gamma x T^4
Avg temp of earth	15C
electromagnetic radiation	travels through vacuum of space everything gives off electromagnetic radiation if above 0K warmer bodies give off radiation at shorter than cooler warmer bodies emit more energy than cooler bodies
greenhouse effects	infrared radiation absorbed by greenhouse gas, they re radiate in all directions
greenhouse gases	Water vapor, CO2, CH4, N2O, O3
Which greenhouse gas absorbs most	H2O
What % of emitted IR from earth absorbed by greenhouse gases	70-85%
% emitted from the sun absorbed	20-25%
What temp with no greenhouse gases	~0F
How much IR emitted from atmosphere to earth	398W/m^2
imbalance	1W/M^-2 temps rise until 0
Where is excess heat going	Ocean(upper and deep), Ice, Land, Atmosphere

Resource summary

	Created by Jacob Sipple almost 5 years ago