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31 Matching questions

  1. The Tacoma Narrows bridge collapsed in 1940 when winds caused ___ to build up in the bridge.
  2. The perceived loudness of a sound is measured in
  3. 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?
  4. In general, sound travels faster through
  5. The Doppler effect occurs with
  6. For a standing wave in an air column in a pipe that is open at both ends, there must be at least
  7. When an air column vibrates in a pipe that is open at both ends,
  8. 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?
  9. At a distance of 3 m, the intensity of a sound will be ___ the intensity it was at a distance of 1 m.
  10. The through of the sine curve used to represent a sound wave corresponds to
  11. At a large distance from a sound source, spherical wave fronts are viewed as
  12. The wavelength of the fundamental frequency of a vibrating string of length L is
  13. When the frequency of a force applied to a system matches the natural frequency of vibration of the system, ___ occurs.
  14. When an air column vibrates in a pipe that is closed at one end,
  15. Two violin players tuning their instruments together hear 8 beats in 2 s. What is the frequency difference between the two violins?
  16. If the intensity of a sound is increased by a factor of 100, the new decibel level will increase
  17. The distance between wave fronts of plane waves corresponds to ___ of a sound wave.
  18. Audible beats are formed by the interference of two waves
  19. The quality of a musical tone of a certain pitch results from a combination of
  20. Which of the following is the region of a sound wave in which the density and pressure are greater than normal?
  21. The property of sound called intensity is proportional to the rate at which energy flows through
  22. Which of the following decibel levels is nearest to the value that you would expect for running a vacuum cleaner?
  23. Sound waves
  24. If a guitar string has a fundamental frequency of 500Hz, what is the frequency of its second harmonic?
  25. Of the following materials, sound waves travel fastest through
  26. 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?
  27. 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?
  28. The intensity of a sound at any distance from the source is directly proportional to the sound's
  29. Pitch depends on the ___ of a sound wave.
  30. 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.
  31. If you are on a train, how will the pitch of the train's whistle sound to you as the train moves?
  1. a 416 Hz
  2. b 2L.
  3. c harmonics.
  4. d a standing wave
  5. e by 20 units.
  6. f resonance
  7. g all waves.
  8. h only odd harmonics are present.
  9. i all harmonics are present.
  10. j frequency
  11. k 8 Hz
  12. l 1000 Hz
  13. m 70 dB
  14. n two antinodes and one node.
  15. o solids than through gases.
  16. p one-ninth
  17. q a rarefaction.
  18. r 495 Hz
  19. s compression
  20. t power.
  21. u are longitudinal waves.
  22. v higher in pitch than
  23. w of slightly different frequencies.
  24. x steel at 0 degrees Celsius.
  25. y decibels.
  26. z The pitch will not change.
  27. aa an area perpendicular to the direction of propagation.
  28. ab one wavelength
  29. ac 4 Hz
  30. ad plane waves.
  31. ae 3 Hz