| Energy and Society 2 |
| Group Project - Basic Science | |
| Matt Stevens, Mark Gibson, Makoto Imai, and John Petkovich | |
| Solar Energy |
| Topics | ||
| The Sun | ||
| The Earth | ||
| Light | ||
| The Sun |
| Characterisitcs |
| G2 Classification of Star (Yellow) | |||
| O,B,A,F,G,K,M | |||
| O - Hottest M - Coolest | |||
| Number is a subdivision of class | |||
| Diameter: 1,3900,000 km | |||
| Mass: 1.989x1030 kg | |||
| Temperature : 15,600,000 K (core) | |||
| Characteristics (continued) |
| Differing layers | |
| Heat transfer by convection | |
| Held together by magnetic fields | |
| Outer temp ~1,000,000 K |
| Composition |
| Energy Production |
| The sun is essentially a large fusion reactor | ||
| Reactions take place in the core | ||
| High temp. and pressure | ||
| Energy is radiated from the core to outer layers | ||
| Temperature decreases as distance increases | ||
| At the corona the magnetic fields increase temperature again | ||
| Resulting energy reaches the planets | ||
| Fusion Reaction |
| The Earth |
| Characteristics |
| Interactions with the Sun |
| What is the Atmosphere | ||
| Power at top - 0.5 cal/min·cm2 | ||
| Power under Atmosphere - 0.24 cal/min·cm2 | ||
| 9% Atmospheric absorption | ||
| 9% Up-scatter from atmosphere | ||
| 25% Up-scatter from clouds (water vapor) | ||
| 10% Absorption to clouds (water vapor) | ||
| Interaction Continued |
| The Atmosphere |
| Light |
| What is it? |
| Charged particles moving in a wave | ||
| wave length denotes color/ visibility | ||
| Reflected wavelengths denote the color in objects | ||
| Absorbed wavelengths produce energy | ||
| (eg.) plants absorb red wavelengths but reflect green | ||
| Slide 16 |
| Mt. St. Helens |
| Slide 18 |