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Astro exam 2
Terms in this set (14)
What determines the color of light? Select all that apply, if any.
Consider the following discussion between two students about the different properties of light.
Student 1: I think I get how light works. If you look at the chart of the EM spectrum, it shows that light with a higher frequency will also have a long wavelength. But it all has the same speed.
Student 2: I disagree. If one type of light has a lot of energy and a high frequency it will have a faster speed than light that has a lower energy and a low frequency.
Which student(s) is/are correct, if either?
neither; both are wrong
Consider the following debate between two students regarding the relationship between parallax angle and the distance we measure to a star.
Student 1: If the distance to the star is more than 1 parsec, then the parallax angle must be more than 1 arcsecond. So a star that is many parsecs away will have a large parallax angle.
Student 2: If we drew a diagram for a st ar that was much more than 1 parsec away from us, the triangle in the diagram would be pointier than the one we just drew in Part II. That should make the parallax angle smaller for a star farther away.
Which student is right, and why?
student 2 is correct because they describe an inverse proportionality relationship between parallax angle and distance: as one quantity gets larger, the other gets smaller, and vice versa
Star Alpha is half as far away as Star Beta. Therefore Star Alpha's parallax angle will be
2 times as large as Star Beta's.
From question 7 on the worksheet: How many times bigger is the separation between Stars A and B compared to the distance between the end points of the line showing the range of the motion for the star exhibiting parallax?
about twice as big
From question 10 on the worksheet: What is the parallax angle for the nearby star exhibiting parallax (in Figure 2 on the worksheet)? (Question 9 from the worksheet refers to the same star.)
To measure a star's parallax angle accurately, you should observe a star's location against the background stars
on many nights over the course of a year
Of the main sequence stars labeled above, which one will have the longest total lifetime?
F (see picture)
If Star Omega and Star Omicron have the same surface temperature and are the same size (radius), which star, if either, is more luminous?
the stars have the same luminosity
You observe two stars with the same luminosity and determine that one has larger radius than the other. Which star is hotter?
the smaller star
Absorption line and emission line spectra of light can directly tell us the __?__ of astronomical objects.
Continuous spectra of light can directly tell us the __?__ of astronomical objects.
What color would the hottest Main Sequence stars look to your eye?
If you receive light from an object that is redshifted, you can conclude that the object...
is moving away from you.
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