Refraction occurs for both sound and light. When refraction occurs there is a change in
1) frequency.
2) wavelength.
3) speed.
4) all of the above.
When sound travels faster near the ground than above, bending of sound tends to be
5) upward.
6) downward.
7) neither of these.
Answer: 3, 5
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In a design using the aluminum alloy 7075-T6, would it be safe to assume that a part could withstand an infinite number of stress applications that are only 50 % of the yield stress? _________
Fill in the blank(s) with the appropriate word(s).
How tiny a spot is the Hubble Deep Field?
A: About 1/2 of the entire sky. B: About 1/5 of the entire sky. C: About 1/10 of the entire sky. D: About 1/50 of the entire sky. E: The size of President Roosevelt's eye on a dime held at arm's length.
For every star with a mass greater than 10 solar masses, about how many stars are there with masses less than a solar mass?
A) 1 B) 3 C) 10 D) 30 E) 200
The total amount of power (in watts, for example) that a star radiates into space is called its ________
A) apparent brightness B) flux C) absolute magnitude D) luminosity