Ch22 - Assignment: Chapter 22 Class: Astronomy I Date:...

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Assignment: Chapter 22 Class: Astronomy I Date: November 12 th , 2007 Review Questions 1. Einstein’s theory describes how motion affects our measurements of distance and time. 2. Those same observers would measure different values of the speed of an airplane. Einstein’s principle applies to light. 3. The burning of fuels cannot be an explanation for the Sun’s energy because it could not continue for a long enough time to explain the age of the Earth. 4. The process of converting hydrogen into helium is called hydrogen fusion. This is fundamentally unlike the burning of a log in fireplace because ordinary burning involves chemical reactions that rearrange the outer electrons of atoms with no effect on the atoms’ nuclei. Hydrogen fusion deals with hydrogen nuclei fusing together to produce a nuclear reaction. 5. If the electric force between protons became stronger, the temperature required for thermonuclear fusion has to be greater in order to overcome the electric repulsion of protons. 6. The Sun’s outer regions do not have enough heat and pressure to carry on the thermonuclear fusion. 7. In step 1, two hydrogen nuclei collide to create a proton and neutron, a hydrogen isotope. One byproduct is neutrino and the other is positron. In step 2, the hydrogen isotope collides with another proton to create helium isotope along with a byproduct of gamma-ray photon. In step 3, two helium isotopes collide to create a different helium isotope and two remaining protons just get released. Overall, two protons collide to create a helium isotope and energy. 8. An example of hydrostatic equilibrium is a floating fish in water. The pressure from water above the fish, weight of the fish, and the pressure from water beneath the fish balance out to create equilibrium. 9.
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Ch22 - Assignment: Chapter 22 Class: Astronomy I Date:...

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