Harmonics and Sound Exam Review

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Name: Class: _ Date: _ Harmonics and Sound Exam Review Multiple Choice Identify the letter of the choice that best completes the statement or answers the question. 1. Which of the following is not an example of approximate simple harmonic motion? a. a ball bouncing on the floor b. a child swinging on a swing c. a piano wire that has been struck d. a car s radio antenna waving back and forth 2. A mass attached to a spring vibrates back and forth. At maximum displacement, the spring force and the a. velocity reach a maximum. c. acceleration reach a maximum. b. velocity reach zero. d. acceleration reach zero. 3. For a mass hanging from a spring, the maximum displacement the spring is stretched or compressed from its equilibrium position is the system s a. amplitude. c. frequency. b. period. d. acceleration. 4. For a system in simple harmonic motion, which of the following is the time required to complete a cycle of motion? a. amplitude c. frequency b. period d. revolution 5. Which of the following features of a given pendulum changes when the pendulum is moved from Earth s surface to the moon? a. the equilibrium position c. the length b. the mass d. the restoring force 6. One end of a taut rope is fixed to a post. What type of wave is produced if the free end is quickly raised and lowered one time? a. pulse wave c. sine wave b. periodic wave d. longitudinal wave 7. When a mechanical wave s amplitude is reduced by half, the energy the wave carries in a given time interval is a. doubled. c. decreased to one-half. b. increased by a factor of 1.4. d. decreased to one-fourth. 8. Waves arriving at a fixed boundary are a. neither reflected nor inverted. c. reflected and inverted. b. reflected but not inverted. d. inverted but not reflected. 9. Two waves traveling in opposite directions on a rope meet and undergo complete destructive interference. Which of the following best describes the waves a moment after the waves meet and coincide? a. the waves reflect and travel backward b. the waves no longer exist c. the waves continue unchanged d. a single wave continues along the rope 1

Name: 10. Each stretched region in the waveform of the longitudinal wave shown above corresponds to what feature of the transverse wave below it? a. wavelength c. troughs b. crests d. amplitude 11. Which of the following types of interference will occur when the pulses in the figure above meet? a. no interference c. destructive interference b. constructive interference d. total interference 12. How many nodes and antinodes are shown in the standing wave above? a. four nodes and four antinodes c. four nodes and five antinodes b. four nodes and three antinodes d. five nodes and four antinodes 13. Sound waves a. are a part of the electromagnetic spectrum. b. do not require a medium for transmission. c. are longitudinal waves. d. are transverse waves. 14. Pitch depends on the of a sound wave. a. frequency c. power b. amplitude d. speed 2

Name: 15. Of the following materials, sound waves travel fastest through a. helium at 0 C. c. copper at 0 C. b. air at 0 C. d. air at 100 C. 16. The Doppler effect occurs with a. only sound waves. c. only water waves. b. only transverse waves. d. all waves. 17. If you are on a train, how will the pitch of the train s whistle sound to you as the train moves? a. The pitch will become steadily higher. b. The pitch will become steadily lower. c. The pitch will not change. d. The pitch will become higher, then become lower. 18. The perceived loudness of a sound is measured in a. hertz. c. watts. b. decibels. d. watts per square meter. 19. The Tacoma Narrows bridge collapsed in 1940 when winds caused to build up in the bridge. a. a compression wave c. resonance b. a longitudinal wave d. friction 20. Musical instruments of different types playing the same note may often be identified by the of their sounds. a. pitch c. fundamental frequency b. intensity d. timbre 21. What is the displacement of a spring that is stretched with a force of 100.0 N and has a spring constant of 20.0 N/m? a. 2000. m c. 120. m b..2000 m d. 5.00 m 22. What is the frequency of a swing that moves back and forth once every 40.0 s? a. 40.0 Hz c. 0.0125 Hz b. 20.0 Hz d..0250 Hz 23. Bats chirp at high frequencies that humans cannot hear. They use the echoes to detect small objects, such as insects, as small as one wavelength. If a bat emits a chirp at a frequency of 60.0 KHz and the speed of sound is 343 m/s, what is the size in millimeters for the smallest insect that the bat can detect? a. 5.72 c..175 b. 572 d. 175 24. The intensity of a sound is 8.0 X 10-4 W/m 2 at a distance of 5.0 m away from the speaker. What is the power of the sound? a. 4.0 X 10-3 W c. 2.5 X 10-3 W b. 2.5 X 10-1 W d. 4.0 X 10-1 W 25. A 12.0 m string has a standing wave in the 4th harmonic. What is the wavelength of the standing wave? a. 3.0 m c..33 m b. 6.0 m d..60 m 26. What harmonic is the 4th overtone? a. 3 rd c. 5th b. 4 the d. 6th 3

Name: 27. A pendulum has a length of 981 m. What is its period on Earth? a. 6.28 s c..628 s b. 628 s d. 62.8 s 28. The period of a mass spring constant is 10.s. What is its spring constant if the mass is 10.0 kg? a. 3.95 N/m c. 6.78 N/m b. 39.5 N/m d. 67.8 N/m 29. What is the frequency of the 6th harmonic on a string whose length is 4.0 m. The speed of the wave on the string is 600. m/s. a..0117 Hz c. 225 Hz b..0233 Hz d. 450 Hz 30. A standing wave in a pipe with one closed end has a frequencies of 257.25 Hz. The length of the pipe is 2.00 m. What harmonic is the pipe playing? a. 4 c. 6 b. 5 d. 7 4

Harmonics and Sound Exam Review Answer Section MULTIPLE CHOICE 1. ANS: A PTS: 1 DIF: I OBJ: 11-1.1 2. ANS: C PTS: 1 DIF: I OBJ: 11-1.2 3. ANS: A PTS: 1 DIF: I OBJ: 11-2.1 4. ANS: B PTS: 1 DIF: I OBJ: 11-2.2 5. ANS: D PTS: 1 DIF: IIIB OBJ: 11-2.3 6. ANS: A PTS: 1 DIF: I OBJ: 11-3.2 7. ANS: D PTS: 1 DIF: II OBJ: 11-3.5 8. ANS: C PTS: 1 DIF: I OBJ: 11-4.3 9. ANS: C PTS: 1 DIF: I OBJ: 11-4.4 10. ANS: C PTS: 1 DIF: I OBJ: 11-3.3 11. ANS: B PTS: 1 DIF: I OBJ: 11-4.2 12. ANS: D PTS: 1 DIF: I OBJ: 11-4.5 13. ANS: C PTS: 1 DIF: I OBJ: 12-1.1 14. ANS: A PTS: 1 DIF: I OBJ: 12-1.2 15. ANS: C PTS: 1 DIF: II OBJ: 12-1.3 16. ANS: D PTS: 1 DIF: I OBJ: 12-1.5 17. ANS: C PTS: 1 DIF: II OBJ: 12-1.5 18. ANS: B PTS: 1 DIF: I OBJ: 12-2.2 19. ANS: C PTS: 1 DIF: II OBJ: 12-2.3 20. ANS: D PTS: 1 DIF: II OBJ: 12-3.3 21. ANS: D PTS: 1 22. ANS: D PTS: 1 23. ANS: A PTS: 1 24. ANS: B PTS: 1 25. ANS: B PTS: 1 26. ANS: A PTS: 1 27. ANS: D PTS: 1 28. ANS: A PTS: 1 29. ANS: D PTS: 1 30. ANS: C PTS: 1 1

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