Chapter 14 Questions - Questions for Chapter 14 1. How does...

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Questions for Chapter 14 1. How does gravitational contraction generate energy? When was it important in the Sun's history? Explain. The Sun generates energy by slowly contracting in size. As the sun’s gas moves inward, the gravitational potential energy is converted into thermal energy. Gravitational contractions could have kept the sun shining steadily for up to about 25 million years because since the Sun has such a large mass, it would only need to contract a little bit to maintain its temperature for a long time. 2. What two forces are balanced in gravitational equilibrium? Describe how gravitational equilibrium makes the Sun hot and dense in its core. Gravity pulling inward and pressure pushing outward. In the sun’s core, nuclear fusion takes place to make the sun hot and dense. The energy released by fusion heats the gas and maintains the pressure that keeps the Sun in balance against the inward pull of gravity. 3. Briefly describe the distinguishing features of each of the interior layers of the Sun. Convection zone: where energy generated in the solar core travels upward, transported by the rising of hot gas and falling of cool gas called convection. Radiation zone: where energy moves outward primarily in the form of photons
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Chapter 14 Questions - Questions for Chapter 14 1. How does...

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