Ch 26: Sound Review 2 Short Answers 1. What is the source of all sound?
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1 Ch 26: Sound Review 2 Short Answers 1. What is the source of all sound? 2. How does a sound wave travel through air? 3. What media transmit sound? 4. What determines the speed of sound in a medium? 5. How far away is a storm if you note a 3-second delay between a lightning flash and the sound of thunder? 6. What happens when an elastic material is disturbed? 7. What causes resonance? 8. What are the effects of constructive and destructive interference? 9. What causes beats? 10. What is the beat frequency when a 262-Hz and a 266-Hz tuning fork are sounded together? Multiple Choice 1. The sound waves that humans cannot hear are those with frequencies a. from 20 to 20,000 Hz. b. below 20 Hz. c. above 20,000 Hz. d. both B and C 2. Sound travels in air by a series of a. compressions. b. rarefactions. 3. Sound travels faster in a. a vacuum compared to liquids. b. gases compared to liquids. c. gases compared to solids. d. solids compared to gases. 4. The speed of sound varies with a. amplitude. b. frequency. c. both compressions and rarefactions. d. pitches. c. temperature. d. pitch.
2 5. The loudness of a sound is most closely related to its a. frequency. b. period. c. wavelength. d. intensity. 6. When you tap various objects they produce characteristic sounds that are related to a. wavelength. c. period. b. amplitude. d. natural frequency. 7. When the surface of a guitar is made to vibrate we say it undergoes a. forced vibration. b. resonance. c. refraction. d. amplitude reduction. 8. When an object is set into vibration by a wave having a frequency that matches the natural frequency of the object, what occurs is a. forced vibration. c. refraction. b. resonance. d. amplitude reduction. 9. Noise-canceling devices such as jackhammer earphones make use of sound a. destruction. c. resonance. b. interference. d. amplification. 10. The phenomenon of beats is the result of sound a. destruction. b. interference. c. resonance. d. amplification. 11. If the energy in a longitudinal wave travels from south to north, the particles of the medium. a. move from north to south, only. b. vibrate both north and south. c. move from east to west, only. d. vibrate both east and west. 12. A transverse wave is traveling through a medium. See diagram below. The particles of the medium are moving. a. parallel to the line joining AD. b. along the line joining CI. c. perpendicular to the line joining AD. d. at various angles to the line CI.
3 13. The main factor which effects the speed of a sound wave is the. a. amplitude of the sound wave b. intensity of the sound wave c. loudness of the sound wave d. properties of the medium e. pitch of the sound wave 14. As a wave travels into a medium in which its speed increases, its wavelength. a. decreases b. increases c. remains the same 15. The is defined as the number of cycles of a periodic wave occurring per unit time. a. wavelength b. period c. amplitude d. frequency 16. Many wave properties are dependent upon other wave properties. Yet, one wave property is independent of all other wave properties. Which one of the following properties of a wave is independent of all the others? a. wavelength b. frequency c. period d. velocity 17. A vibrating object with a frequency of 200 Hz produces sound which travels through air at 360 m/s. The number of meters separating the adjacent compressions in the sound wave is. a b. 1.8 c. 3.6 d. 7.2 e If two crests meet while passing through the same medium, then constructive interference occurs. 19. A node is a point along a medium where there is always. a. a crest meeting a crest b. a trough meeting a trough c. constructive interference d. destructive interference e. a double rarefaction. 20. It is possible that one vibrating object can set another object into vibration if the natural frequencies of the two objects are the same.
4 21. A standing wave experiment is performed to determine the speed of waves in a rope. The standing wave pattern shown below is established in the rope. The rope makes 90.0 complete vibrational cycles in exactly one minute. The speed of the waves is m/s. a. 3.0 b. 6.0 c. 180 d. 360 e The distance between successive nodes in any standing wave pattern is equivalent to wavelengths. a. 1/4 b. 1/2 c. 3/4 d. 1 e A 20.0-cm long pipe is covered at one end in order to create a closed-end air column. A vibrating tuning fork is held near its open end, forcing the air to vibrate in its first harmonic. The wavelength of the standing wave pattern is. a. 5.0 cm b cm c cm d cm e cm 24. The diagrams represent four different standing wave patterns in air columns of equal length. Which of the columns will produce the note having the highest pitch? a. A b. B c. C d. D e. All column produce notes having the same pitch 25. In order for two sound waves to produce audible beats, it is essential that the two waves have. a. the same amplitude b. the same frequency c. the same number of overtones d. slightly different amplitudes e. slightly different frequencies 26. Two tuning forks with frequencies of 256 Hz and 258 Hz are sounded at the same time. Beats are observed; 2 beats will be heard in 2 s.
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