Quiz 03/28/2013

1. Why does the Sun shine? The Sun shines because it sends out energy in all directions as radiation. This radiation takes the form of light and heat.
2. What is the Sun's structure? Core, radiation zone, convection zone, photosphere, chromosphere, and corona.
3. How does nuclear fusion occur in the Sun? When the gravitational equilibrium and energy balance together act as a thermostat to regulate the core temperature because the fusion rate is sensitive to temperature.
4. How does the energy from fusion get out of the Sun? By randomly bouncing photons carrying it through the radiation zone. 
5. What is nuclear fission? A nuclear reaction in which a heavy nucleus splits spontaneously or on impact with another particle with the release of energy.
6. Are neutrinos formed in nuclear fusion? Yes
7. Are photons created in nuclear fusion? Yes
8. Does the Sun have the same temperature throughout? No
9. Which element is created in the Sun? Helium
10. What fraction of mass is converted into energy in the Sun's core? 0.7%