Unit 12 Quiz#1
1. When two waves meet along the same medium, _____________ occurs.
2. A sound wave is different than a light wave in that a sound wave is
3. The "buzz" of a mosquito produces an intensity having a 40-dB rating. How many times more intense is the sound of normal conversation if it has an intensity rating of 60-dB?
4. An open-end resonance tube sounds out a fifth harmonic at 1600 Hz. The frequency of the third harmonic is
5. A pulse traveling along a stretched spring which is fixed at its end to a wall. Compared to the pulse's speed before reflecting off the fixed end, its speed after reflection is
6. A pulse traveling along a stretched spring which is fixed at its end to a wall. The reflected pulse will be
7. By definition, the fundamental frequency is
8. Two notes which have a frequency ratio of 2:1 are said to be separated by an octave. A note which is separated by an octave from middle C (256 Hz) is
9. The pitch of a sound refers to the __________ of the sound wave.
10. Sound waves are known to exhibit the Doppler effect. This means that
11. Doubling the frequency of a wave source doubles the speed of the waves.
12. When water waves reach an obstacle in the medium, they bend around the obstacle into the region behind it. This is evidence of the phenomenon of
13. A standing wave is different than a traveling wave in that
Consider the standing wave pattern below in answering this next three questions.
14. This standing wave pattern represents the _____ harmonic.
15. The number of nodes in the entire pattern is
16. Destructive interference occurs at point(s)
17. Which one of the following factors determines the pitch of a sound?
18. A standing wave is formed when
19. A 120-cm closed end resonance tube resonates with the frequency of the fifth harmonic. The wavelength of the fifth harmonic is
20. The time required for the waves (v = 340 m/s) to travel from the tuning fork to point P is
Two speakers are arranged so that sound waves with the same frequency are produced and radiate through the room. An interference pattern is created (as represented in the diagram below). The thick lines in the diagram represent wave crests and the thin lines represent wave troughs. Use the diagram to answer the next three questions.
21. Which two points are located on the same nodal line?
22. At which point(s) would constructive interference occur?
23. How many of the six labeled points represent anti-nodes?
24. Miles Tugo is camping in Glacier National Park. In the midst of a glacier canyon, he makes a loud hollar. The sound (v = 345 m/s) bounces off the nearest canyon wall (which is 120 meters away) and returns to Miles. Determine the time elapsed between when Miles makes the hollar and the echo is heard. PSYW
25. A guitar string has a set of natural frequencies. Calculate at least three values of the set for a 60.0-cm guitar string. Assume the speed of a wave in the guitar string is 480 m/s. PSYW
26. Pipin' Pete and the Pop Bottles are playing at Shades in Lincolnshire next weekend. One of the pop bottles (a closed-end air column) is capable of sounding out a fundamental frequency of 260 Hz. The speed of sound in the pop bottle is 350 m/sec. Find the length of the air column in the pop bottle. PSYW
© Tom Henderson, 1996-1998
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