21st Century Astronomy
21st Century Astronomy
6th Edition
ISBN: 9780393428063
Author: Kay
Publisher: NORTON
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Chapter 14, Problem 43QP
To determine

To verify the claim that the Sun produces more energy per second than all the electric power plants on Earth could generate in a half-million years.

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Why are measurements of the Sun's 10.7 cm radio emission used to monitor the state of the solar cycle?  Choose all correct answers. A. It provides a repeatable, objective measurement of solar activity    B. It serves as a good proxy for EUV emissions   C. It is measured from space, so it is not affected by clouds   D. It can be used to predict the occurrence of coronal mass ejections
1. The mass of the Sun is about 2x10³0 kg. The Sun was about 72% hydrogen when it first formed. About 11% of the total amount of the Sun's hydrogen is available for fusion within the Sun's core. [3 points] (a) What is the total mass of hydrogen available for fusion, in kg? (b) The Sun fuses about 600 billion kg of hydrogen each second. Calculate how long the Sun's initial supply of hydrogen can last. Give your answer in both seconds and years. Hint: use the result you calculated in part (a). (c) We know that our Solar System is about 4.5 billion years old. Using your calculation above, how much longer do we have until the Sun runs out of hydrogen?
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