Chaisson and McMillan - Astronomy Today 4/e (Homework)

James Finch

Astronomy, section 1, Fall 2010

Instructor: Dr. Friendly

Current Score: 9/18

Due: Tuesday, November 2, 2010 08:30 EDT

Question

Points

1	2	3	4	5	6
1	2/3	0/4	0/1	4/5	2/4

Total

9/18

Description

Here are some textbook questions from Astronomy Today 4/e by Chaisson and McMillan published by Prentice Hall. Click here for a list of all of the questions coded in WebAssign.

Instructions

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. 1/1 points All Submissions Notes Question: AT4 1.P.01.

Question part

Points

Submissions

1
1
4/50

Total

1/1

In one second, light leaving Los Angeles reaches approximately as far as one of the following. Which is correct?

San Francisco, about 500 km the nearest star, about three light-years from Earth. London, roughly 10,000 km Venus, 45,000,000 km from Earth at closest approach the Moon, 384,000 km

Your answer is correct.

2. 2/3 points All Submissions Notes Question: AT4 2.P.01.

Question part

Points

Submissions

1	2	3
1	1	0/1
2/50	2/50	4/50

Total

2/3

Tycho Brahe's observations of the stars and planets were accurate to about one arc minute (1'). To what distance does this angle correspond at the distance of each of the following objects?

(a) the Moon
Enter a number.
1 km
(b) the Sun
Enter a number.
2 km
(c) Saturn (at closest approach)
Enter a number.
3 km

3. 0/4 points All Submissions Notes Question: AT4 3.TB.002.

Question part

Points

Submissions

1	2	3	4
0/1	0/1	0/1	0/1
1/50	1/50	1/50	1/50

Total

0/4

Match the type of electromagnetic radiation to its definition.

high energy photons given off by sources at millions of degrees	1
trapping of these waves by carbon dioxide creates "Greenhouse"	2
waves under 4,000 Angstroms, blocked by the ozone layer	3
longest waves coming from the coldest sources	4

4. 0/1 points All Submissions Notes Question: AT4 4.P.06.

Question part

Points

Submissions

1
0/1
1/50

Total

0/1

Calculate the energy change in the transition responsible for the left-hand yellow sodium line shown in Figure 4.6.
Your answer is incorrect.

Figure 4.6

5. 4/5 points All Submissions Notes Question: AT4 5.RD.20.

Question part

Points

Submissions

1	2	3	4	5
1	0/1	1	1	1
1/50	1/50	1/50	1/50	1/50

Total

4/5

Our eyes can see light with an angular resolution of about 1' - equivalent to about a third of a millimeter at arm's length. Suppose our eyes detected only infrared radiation, with 1° angular resolution. Would we be able to make our way around on Earth's surface?

yes no

Your answer is correct.

To read?

yes no

Your answer is incorrect.

To sculpt?

yes no

Your answer is correct.

To create technology?

yes no

Your answer is correct.

Explain.

6. 2/4 points All Submissions Notes Question: AT4 5.TB.002.

Question part

Points

Submissions

1	2	3	4
1	1	0/1	0/1
1/50	1/50	1/50	1/50

Total

2/4

Match the design of telescope with its description.

uses a lens to collect light; subject to chromatic aberration	1
combines light from two different telescopes to greatly enhance resolution	2
the convex secondary bounces light down hole to focus behind hole in main mirror	3
its flat secondary mirror, tilted 45°, focuses the image to the front side of the tube	4

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Chaisson and McMillan - Astronomy Today 4/e (Homework)

Current Score: 9/18