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Sound Review

Sound Review. What type of wave is a sound wave?. Mechanical and Transverse Mechanical and Longitudinal Electromagnetic and Transverse Electromagnetic and Longitudinal. The main factor that determines the speed of a sound wave is…. The amplitude The frequency The intensity

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Sound Review

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  1. Sound Review

  2. What type of wave is a sound wave? • Mechanical and Transverse • Mechanical and Longitudinal • Electromagnetic and Transverse • Electromagnetic and Longitudinal

  3. The main factor that determines the speed of a sound wave is… • The amplitude • The frequency • The intensity • The properties of the medium • The wavelength

  4. Which of the following factors determines the pitch of a sound? • Amplitude • Intensity • Frequency • Phase • Speed

  5. The standing wave pattern shown below represents which harmonic? • First • Second • Third • Fourth • Fifth

  6. What two characteristics determine if a sound can be heard? • Frequency and wavelength • Frequency and Intensity • Intensity and Power • Intensity and Amplitude • Amplitude and wavelength

  7. Participant Scores

  8. The Doppler Effect describes… • The ability of a single pipe to play multiple notes • One vibrating object forcing another to vibrate • The formation of beat patterns • Perceived frequency changes due to relative motion • The differences between notes on a flute and a trumpet

  9. While driving, you hear a police car siren approaching from behind. If the siren produces a 1500 Hz sound, you will hear a sound… • Greater than 1500 Hz • Less than 1500 Hz • Equal to 1500 Hz • You will not be able to hear this sound

  10. Front row at a rock concert may reach upwards of 120 dB. How many times more intense is this than typical conversation at 60 dB? • 1,000,000x • 2x • 60x • 10x • 600x

  11. Four machines operating simultaneously produce a 80 dB sound. How many of these machines would it take to produce a 100 dB sound? • 40 • 16 • 80 • 400 • 5

  12. The human voice has been shown to be capable of shattering a glass. This is possible due to… • Resonance • Doppler Effect • Interference • Harmonics • Timbre

  13. Participant Scores

  14. You are traveling in a car near by a moving train. The train sounds its whistle, but you fail to hear the Doppler effect. This may be because… • You are traveling away from the train too fast to detect it • You are traveling towards the train too fast to detect it • You are traveling at the same speed as the train • You are traveling away from the train too slowly to detect it • You are traveling towards the train to slowly to detect it

  15. At room temperature, sound will travel most slowly through which of the following? • Iron • Water • Aluminum • Mercury • Helium

  16. Two pipes are exactly the same length, but one is open and the other is closed at one end. Which pipe’s fundamental frequency will be the higher pitch? • Open pipe • Closed pipe • Both fundamentals will be the same

  17. An observer is sitting in a train. The train blows its whistle as it accelerates from rest along the track moving faster and faster. The frequency of sound detected by the observer compared to the original whistle will be… • The same • Higher • Lower • Zero

  18. If the distance from a source of sound is doubled, the intensity of the sound will change by a factor of… • 2 • 4 • ½ • ¼ • No change

  19. Participant Scores

  20. A string on a guitar produces a 440 Hz note when plucked. What would be the 4th harmonic of this string? • 440 Hz • 110 Hz • 880 Hz • 1760 Hz • There is no 4th harmonic for a string

  21. A flute of length 60.0 cm behaves as an open pipe. What is the 2nd harmonic of this flute? (assume v = 343 m/s) • 285 Hz • 570 Hz • 143 Hz • 120 Hz • 240 Hz

  22. If the pipe represented below has a length of 3.0 m, what is the wavelength of the harmonic shown? • 1.0 m • 2.0 m • 3.0 m • 1.5 m • 0.67 m

  23. A 100 W speaker is operating at full power. What is the intensity of sound 3.0 m away? • 0.88 W/m2 • 707 W/m2 • 72 W/m2 • 2.7 W/m2 • 0 W/m2

  24. A piano tuner uses a 320 Hz tuning fork to tune a string. If she hears 3 beats per second and a lower pitch than expected, the string is vibrating at… • 320 Hz • 323 Hz • 317 Hz • 960 Hz • 107 Hz

  25. Participant Scores

  26. 500 Point Final Question!!!How many times more intense is a 65 dB sound compared to a 60 dB sound? • 5.0 x • 3.2 x • 1.1 x • 105 x • 10-5 x *You will not be asked to do this on the test!!!

  27. Participant Scores

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