 # Ch. 19-21 Review Problems

```Physics Review Problems
Chapters 19-21
2/4/2015
1. What is the period of a sound wave whose wavelength is 17.0 m?
2. A floating leaf oscillates up and down two complete cycles in one second as a water
wave passes by. The wave's wavelength is 14 meters. What is the wave's speed?
3. A krypton atom has a larger atomic number than a neon atom, which has a larger
atomic number than a helium atom. At the same temperature and pressure,
consider the speed of sound in these three gases, and list the gases in order from
the one experiencing the slowest speed of sound to the fastest speed of sound.
4. How many times a minute will you be in step with a friend when you walk at 77
steps per minute and your friend walks at 65 steps per minute?
5. You see a flash of lightning, then hear a crack of thunder 6 seconds later. How far
away from you did the lightning strike occur?
Physics Review Problems
Chapters 19-21
2/4/2015
6. Calculate the frequency of a sound wave that has a wavelength of 2 m in room-
temperature air.
7. The amplitude of a particular transverse wave is 4.0 m. Calculate the top-to-
bottom distance of the disturbance creating the wave.
8. What is the frequency of the minute hand on a clock?
9. A certain ocean wave has a frequency of 0.29 hertz and a wavelength of
3.5 meters. What is the wave’s speed?
10. How many times more intense is a 110-dB sound than a 70-dB sound?
Physics Review Problems
Chapters 19-21
2/4/2015
11. What beat frequency is produced by two tuning forks that vibrate simultaneously
with frequencies 300 Hz and 311 Hz?
12. A boat at anchor is rocked by waves whose crests are 22 m apart and whose speed
is 5 m/s. How often do these waves reach the boat?
have a speed of 3.00
108 m/s, what is the wavelength of these waves?
14. A supersonic aircraft produces a shock wave that describes a 30° cone. What
happens to the angle of the cone as the aircraft travels faster?
15. A wave has two crests and two troughs each second. If the wave travels an
average distance of 17 meters in 5 seconds, what is its wavelength?
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