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Chaisson & McMillan - Astronomy: A Beg. Guide 5/e (Homework)

Chris Read

Addison Wesley, section 1, Fall 2010

Instructor: Dr. Friendly

Current Score : 0 / 11

Due : Monday, August 23, 2010 10:00 PM EDT

About this Assignment

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Question
Points
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0/1 0/3 0/1 0/2 0/3 0/1
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0/11

Description

Here are some textbook and testbank questions from Astronomy: A Beginners Guide to the Universe 5/e by Chaisson and McMillan published by Prentice Hall. Click here for a list of all of the questions coded in WebAssign.


Instructions

This assignment will show you the three types of questions available for Astronomy: A Beginners Guide, Self-Test (ST), Review and Discussion (RD), and Problems (P).

This demo assignment allows many submissions and makes the answer key available after the first submission so you can see the correct answers. (Typically, the answer key is posted after the due date!)



1. –/1 points Notes Question: BG5 1.P.05.
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A comet has a perihelion distance of 0.9 A.U. and an orbital period of 80 years. What is its aphelion distance from the Sun?
Enter a number.
 A.U.

2. –/3 points Notes Question: BG5 2.P.08.
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How many different photons (that is, photons of different frequencies) can be emitted as a hydrogen atom in the second excited state falls back, directly or indirectly, to the ground state?
Enter an exact number.

What are their wavelengths? (Select all that apply.)



What about a hydrogen atom in the third excited state?
Enter an exact number.


3. –/1 points Notes Question: BG5 3.ST.04.
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Radio telescopes are large in part to improve their angular resolution, which is poor because of the long wavelengths at which they observe.
    



4. –/2 points Notes Question: BG5 4.P.02.
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An asteroid (Figure 4.5) has a perihelion distance of 0.23 A.U. and an orbital eccentricity of 0.83. What is its semi-major axis and aphelion distance from the Sun?
semi-major axis
Enter a number.
 A.U.
aphelion distance from the Sun
Enter a number.
 A.U.


Figure 4.5



5. –/3 points Notes Question: BG5 5.RD.06.
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What is the greenhouse effect?

Is the greenhouse effect operating in Earth's atmosphere helpful or harmful?
    


What are the consequences of an enhanced greenhouse effect?


6. –/1 points Notes Question: BG5 9.P.10.
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Suppose the entire reaction sequence shown in Figure 9.26 generates 3.7 10-12 joules of electromagnetic energy and releases two neutrinos. Assume that all of the Sun's energy comes from this sequence and that neutrino oscillations transform half of the neutrinos produced into other particles by the time they travel one A.U. from the Sun. Estimate the total number of solar neutrinos that pass through Earth each second.
Enter a number.
 neutrinos per second


Figure 9.26


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