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31 True/False questions

1. When an air column vibrates in a pipe that is closed at one end,only odd harmonics are present.

2. The Doppler effect occurs withare longitudinal waves.

3. Which of the following decibel levels is nearest to the value that you would expect for running a vacuum cleaner?compression

4. The quality of a musical tone of a certain pitch results from a combination ofharmonics.

5. The distance between wave fronts of plane waves corresponds to ___ of a sound wave.frequency

6. A train moves down the track towards an observer. The sound from the train, as heard by the observer, is ___ the sound heard by a passenger on the train.higher in pitch than

7. In general, sound travels faster throughsteel at 0 degrees Celsius.

8. Two violin players tuning their instruments together hear 8 beats in 2 s. What is the frequency difference between the two violins?power.

9. When an air column vibrates in a pipe that is open at both ends,all harmonics are present.

10. If the intensity of a sound is increased by a factor of 100, the new decibel level will increasepower.

11. At a distance of 3 m, the intensity of a sound will be ___ the intensity it was at a distance of 1 m.compression

12. Of the following materials, sound waves travel fastest throughsolids than through gases.

13. Audible beats are formed by the interference of two wavesfrequency

14. Sound wavesall waves.

15. For a standing wave in an air column in a pipe that is open at both ends, there must be at leastall harmonics are present.

16. Pitch depends on the ___ of a sound wave.all waves.

17. When the frequency of a force applied to a system matches the natural frequency of vibration of the system, ___ occurs.resonance

18. A vibrating guitar string emits a tone just as a 5.00 x 10^2 Hz tuning fork is stuck. If five beats per second are heard, which of the following is a possible frequency of vibration of the string?495 Hz

19. The property of sound called intensity is proportional to the rate at which energy flows throughan area perpendicular to the direction of propagation.

20. The perceived loudness of a sound is measured infrequency

21. If you are on a train, how will the pitch of the train's whistle sound to you as the train moves?The pitch will not change.

22. If a guitar string has a fundamental frequency of 500Hz, what is the frequency of its second harmonic?2L.

23. The through of the sine curve used to represent a sound wave corresponds todecibels.

24. At a large distance from a sound source, spherical wave fronts are viewed asdecibels.

25. Four beats per second are heard when two notes are sounded. The frequency of one note is 420 Hz. Which of the following is a possible frequency of the other note?3 Hz

26. Which of the following is the region of a sound wave in which the density and pressure are greater than normal?compression

27. The Tacoma Narrows bridge collapsed in 1940 when winds caused ___ to build up in the bridge.a standing wave

28. The wavelength of the fundamental frequency of a vibrating string of length L is2L.

29. How many beats per second re heard when two vibrating tuning forks having frequencies of 216 Hz and 224 Hz are held side by side?3 Hz

30. How many beats per second are heard when two vibrating tuning forks having frequencies of 342 Hz and 345 Hz are held side by side?8 Hz

31. The intensity of a sound at any distance from the source is directly proportional to the sound'sby 20 units.