We will have a short test next Wednesday, January 28. It will cover waves and sound. Today you had time to work on some review problems: p.388 #7, 8, 10, 31, 33 and p. 401 #1, 5, 10, 20, 24. Please complete these
in your notebook. Since you cannot take the book home, the problems also appear below.
p.388
7.) Distinguish between the
period and the
frequency of a vibration or a wave. How do they relate to one another?
8.) Does the medium in which a wave travels move along with the wave itself? Defend your answer.
10.) As the frequency of sound is increased, does the wavelength increase of decrease? Give an example.
31.) Astronomers find that light coming from point A at the edge of the sun has a slightly higher frequency than light from point B at the opposite side. What do these measurements tell you about the sun's motion?
33.) Whenever you watch a high-flying aircraft overhead, it seems that its sound comes from behind the craft rather than from where you see it. Why is this?
p.401
1.) What is the source of all sounds?
5.) a. Distinguish between
compressions and
rarefactions of a sound wave.
b. How are compressions and rarefactions produced?
10.) Why is sound louder when a vibration source is held to a sounding board?
20.) What is the beat frequency when when a 494-Hz tuning fork and a 496-Hz tuning fork are sounded together?
24.) What two physics mistakes occur in a science fiction movie when you see and hear at the same time a distant explosion in outer space?
