Name:______________________________Class:__________________ Date:__________________ Assessment Sound Teacher Notes and Answers 12 Sound SOUND WAVES 1. 2. 3. 4. 5. 6. 7. 8. 9. b a c a c d a b As the object moves in one direction, it pushes against the air in that direction, forming a compression by squeezing the molecules closer together. As the object moves in the opposite direction, the air molecules spread apart, forming a rarefaction. As the object continues to vibrate, a series of compressions and rarefactions travel through the air, creating a sound wave. 10. Wave 1. The waves are traveling at the same speed if they are in the same medium. Therefore, the wave with the shorter wavelength (Wave 1) is created by the higher frequency. Original content Copyright © by Holt, Rinehart and Winston. Additions and changes to the original content are the responsibility of the instructor. Holt Physics 1 Section Quizzes Name:______________________________Class:__________________ Date:__________________ Assessment Sound Section Quiz: Sound Waves Write the letter of the correct answer in the space provided. _____ 1. A sound wave is an example of a(n) ______________ wave. a. transverse b. longitudinal c. crest-and-trough d. electromagnetic _____ 2. A sound wave consists of a series of a. compressions and rarefactions. b. longitudes and latitudes. c. hills and valleys. d. perpendicular vibrations _____ 3. The human perception of pitch depends on a sound’s a. velocity. b. wavelength. c. frequency. d. amplitude. _____ 4. Sound generally travels faster through solids than through gases because the particles (atoms or molecules) of a solid are _______________ than the particles of a gas. a. closer together b. heavier c. warmer d. larger _____ 5. Sound waves from a vibrating source travel a. in one direction. b. in two directions. c. in all directions. d. back and forth. _____ 6. Spherical wave fronts can be treated as parallel lines when a. they are very near the source. b. the frequency is very high. c. the wavelength is very large. d. they are a large distance from the source. Original content Copyright © by Holt, Rinehart and Winston. Additions and changes to the original content are the responsibility of the instructor. Holt Physics 2 Section Quizzes Name:______________________________Class:__________________ Date:__________________ Sound continued _____ 7. When you hear the sound from a vehicle that is moving toward you, the pitch is higher than it would be if the vehicle were stationary. The pitch sounds higher because the a. sound waves arrive more frequently. b. sound from the approaching vehicle travels faster. c. wavelength of the sound waves becomes greater. d. amplitude of the sound waves increases. _____ 8. Suppose you are on a moving bus as it passes a stationary car in which a stereo is playing music. As the bus goes past the car, you will hear the pitch of the music a. become higher. b. become lower. c. remain constant. d. become lower, then higher. 9. Describe how a sound wave is created by an object vibrating in air. Use the words compression and rarefaction correctly in your explanation. _________________________________________________________________ _________________________________________________________________ _________________________________________________________________ _________________________________________________________________ 10. The diagrams above represent sound waves created by two different vibrating objects. Assuming that both waves are traveling through the same medium, which wave is produced by the object vibrating at the higher frequency? Explain your choice. _________________________________________________________________ _________________________________________________________________ _________________________________________________________________ _________________________________________________________________ Original content Copyright © by Holt, Rinehart and Winston. Additions and changes to the original content are the responsibility of the instructor. Holt Physics 3 Section Quizzes
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