Chapter 16 review

    Standardized test practice
    1. Which is the best choice to amplify a sound?
      1. soundproofing insulation
      2. underwater sonic substratum echo mechanism
      3. tuning fork
      4. resonance tube

    2. The sound from a train approaching you is higher in pitch than the sound from a train moving away from you. This is an example of
      1. supersonic motion.
      2. the Fourier theorem.
      3. the law of superposition.
      4. the Doppler effect.

      3. Graph of a wave's movement over time
    3. The graph is a representation of a sound wave traveling at 343 m/s. What is its wavelength?
      1. 0.61 m
      2. 1.00 m
      3. 1.65 m
      4. 20.6 m

    4. Two loudspeakers play different notes, one at 440 Hz and the other at 430 Hz. What will a listener hear when these notes interfere?
      1. refraction
      2. beats
      3. reverberation
      4. diffraction

    5. The lowest string on a violin has a fundamental frequency of G at 196 Hz. Which frequency represents the second harmonic of the string?
      1. 98 Hz
      2. 196 Hz
      3. 392 Hz
      4. 588 Hz

    6. Which is not an example of resonance of sound?
      1. a tuning fork
      2. sounding a note by blowing air over a bottle
      3. playing a trombone
      4. a laser

    1. A hiker in a canyon calls out “Hello!” and hears her echo back in 2 s. If the speed of sound is 343 m/s and her voice is at a frequency of 350 Hz, how far away is the canyon wall?
      1. 343 m
      2. 350 m
      3. 672 m
      4. 686 m

      2. String resonating on a standing wave
    2. How many nodes and antinodes are there in the resonating string above?
      1. three nodes and two antinodes
      2. three nodes and three antinodes
      3. four nodes and three antinodes
      4. four nodes and six antinodes

    3. A speaker plays a note at 30 dB. Nine other speakers are added and play the same note in phase at the same amplitude. What is their collective volume?
      1. 40 dB
      2. 270 dB
      3. 3.3 dB
      4. 50 dB

    4. A sound column vibrates in an organ pipe of length 75 cm and with two open ends. If sound travels at 343 m/s in air, what is the frequency of the first harmonic in this pipe?
      1. 115 Hz
      2. 686 Hz
      3. 229 Hz
      4. 0.219 Hz

    5. A 3 m sound wave is traveling in air at 343 m/s when it enters water, where the speed of sound is 1,482 m/s. If you assume that the wave loses no energy entering the water, what is its wavelength in water?
      1. 13 m
      2. 494 m
      3. 4.3 m
      4. 114 m

    6. A sound wave of the note “A” has a frequency of 440 Hz in air. Which of these is closest to the wavelength of this sound? (The speed of sound in air is 343 m/s.)
      1. the length of a bug
      2. the height of a desk
      3. the length of a car
      4. the width of a highway

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