20606420
Description
Flashcards by Jacob Sipple, updated more than 1 year ago
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Created by Jacob Sipple
over 4 years ago
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| 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 |
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