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Unit 12 Quiz#1

Equations:

v = f x w

f = 1/T

v = d/t

v = 331 + .60 T

Multiple Choice:

1. When two waves meet along the same medium, _____________ occurs.

  1. interference
  2. refraction
  3. dispersion
  4. reflection


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Interference of Waves (14 seconds)

 

2. A sound wave is different than a light wave in that a sound wave is

  1. produced by an oscillating object and a light wave is not.
  2. not capable of traveling through a vacuum.
  3. not capable of diffracting and a light wave is.
  4. capable of existing with a variety of frequencies and a light wave has a single frequency.


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Sound is a Mechanical Wave (13 seconds)

 

3. The "buzz" of a mosquito produces an intensity having a 40-dB rating. How many times more intense is the sound of normal conversation if it has an intensity rating of 60-dB?

  1. 2
  2. 20
  3. 100
  4. 200
  5. 400


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Intensity and the Decibel Scale (5 seconds)

 

4. An open-end resonance tube sounds out a fifth harmonic at 1600 Hz. The frequency of the third harmonic is

  1. 320 Hz
  2. 533 Hz
  3. 960 Hz
  4. 1600 Hz
  5. 2667 Hz


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Fundamental Frequency and Harmonics (12 seconds)

 

5. A pulse traveling along a stretched spring which is fixed at its end to a wall. Compared to the pulse's speed before reflecting off the fixed end, its speed after reflection is

  1. less.
  2. greater.
  3. the same.


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Boundary Behavior (14 seconds)

 

6. A pulse traveling along a stretched spring which is fixed at its end to a wall. The reflected pulse will be

  1. inverted.
  2. erect.
  3. neither of these.


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Boundary Behavior (14 seconds)

 

7. By definition, the fundamental frequency is

  1. the lowest possible frequency an instrument can play.
  2. the lowest frequency which a human ear can hear.
  3. the frequency associated with the threshold of hearing.
  4. a frequency in the lowest octave of the musical scales.


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8. Two notes which have a frequency ratio of 2:1 are said to be separated by an octave. A note which is separated by an octave from middle C (256 Hz) is

  1. 128 Hz
  2. 254 Hz
  3. 258 Hz
  4. 345 Hz
  5. none of these

 

9. The pitch of a sound refers to the __________ of the sound wave.

  1. amplitude
  2. wavelength
  3. frequency
  4. deciBel
  5. speed


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Pitch of Sound (7 seconds)

 

10. Sound waves are known to exhibit the Doppler effect. This means that

  1. the frequency of any harmonic is a multiple of the first harmonic.
  2. the speed of sound waves is dependent only upon the properties of the medium.
  3. the amplitude decreases with time.
  4. sound waves can force other objects into vibrating at their natural frequency.
  5. the perceived pitch from a moving source is different than the actual frequency.


Useful Web Links

The Doppler Effect and Shock Waves (9 seconds)

 

11. Doubling the frequency of a wave source doubles the speed of the waves.

  1. True
  2. False


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The Speed of a Wave (10 seconds)

The Wave Equation (7 seconds)

 

12. When water waves reach an obstacle in the medium, they bend around the obstacle into the region behind it. This is evidence of the phenomenon of

  1. refraction
  2. diffraction
  3. reflection
  4. superposition


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Reflection, Refraction, and Diffraction (11 seconds)

 

13. A standing wave is different than a traveling wave in that

  1. particle of the medium are never disturbed in a standing wave.
  2. particles of the medium move from one end of the medium to the other in a traveling wave.
  3. in a standing wave the same points of the medium are oscillating with the greatest amplitude.
  4. traveling waves have speeds that depend on the medium and standing waves have no speed.


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Traveling Waves vs. Standing Waves (5 seconds)

 

 

Consider the standing wave pattern below in answering this next three questions.

14. This standing wave pattern represents the _____ harmonic.

  1. fourth
  2. seventh
  3. eighth
  4. sixteenth


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Harmonics and Patterns (2 seconds)

 

15. The number of nodes in the entire pattern is

  1. 7
  2. 8
  3. 9
  4. 16


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Nodes and Anti-nodes (8 seconds)

 

16. Destructive interference occurs at point(s)

  1. B, C, and D
  2. A, E, and F
  3. A only
  4. C only
  5. all points


Useful Web Links

Nodes and Anti-nodes (8 seconds)

 

 

17. Which one of the following factors determines the pitch of a sound?

  1. the amplitude of the sound wave
  2. the distance of the sound wave from the source
  3. the frequency of the sound wave
  4. the phase of different parts of the sound wave
  5. the speed of the sound wave


Useful Web Links

Pitch of Sound (7 seconds)

 

18. A standing wave is formed when

  1. a wave refracts due to changes in the properties of the medium.
  2. a wave reflects off a canyon wall and is heard shortly after it is formed.
  3. red, orange, and yellow wavelengths bend around suspended atmospheric particles.
  4. two identical waves moving different directions along the same medium interfere.


Useful Web Links

Formation of Standing Waves (12 seconds)

Standing Wave Patterns (9 seconds)

 

19. A 120-cm closed end resonance tube resonates with the frequency of the fifth harmonic. The wavelength of the fifth harmonic is

  1. 24 cm
  2. 48 cm
  3. 96 cm
  4. 150 cm
  5. 300 cm


Useful Web Links

Fundamental Frequency and Harmonics (12 seconds)

Closed-End Air Columns (21 seconds)

 

20. The time required for the waves (v = 340 m/s) to travel from the tuning fork to point P is

  1. 0.020 sec.
  2. 0.059 sec.
  3. 0.59 sec.
  4. 2.9 sec.


Useful Web Links

The Speed of Sound (6 seconds)

 

Two speakers are arranged so that sound waves with the same frequency are produced and radiate through the room. An interference pattern is created (as represented in the diagram below). The thick lines in the diagram represent wave crests and the thin lines represent wave troughs. Use the diagram to answer the next three questions.

21. Which two points are located on the same nodal line?

  1. A and B
  2. D and E
  3. C and F
  4. E and A


Useful Web Links

Nodes and Anti-nodes (8 seconds)

 

22. At which point(s) would constructive interference occur?

  1. B only
  2. A, B, and C
  3. D, E, and F
  4. A and B


Useful Web Links

Nodes and Anti-nodes (8 seconds)

 

23. How many of the six labeled points represent anti-nodes?

  1. 1
  2. 2
  3. 3
  4. 4
  5. 6


Useful Web Links

Nodes and Anti-nodes (8 seconds)

 

 

Problem Solving

24. Miles Tugo is camping in Glacier National Park. In the midst of a glacier canyon, he makes a loud hollar. The sound (v = 345 m/s) bounces off the nearest canyon wall (which is 120 meters away) and returns to Miles. Determine the time elapsed between when Miles makes the hollar and the echo is heard. PSYW


Useful Web Links

The Speed of Sound (6 seconds)

 

25. A guitar string has a set of natural frequencies. Calculate at least three values of the set for a 60.0-cm guitar string. Assume the speed of a wave in the guitar string is 480 m/s. PSYW


Useful Web Links

Guitar Strings (8 seconds)

 

26. Pipin' Pete and the Pop Bottles are playing at Shades in Lincolnshire next weekend. One of the pop bottles (a closed-end air column) is capable of sounding out a fundamental frequency of 260 Hz. The speed of sound in the pop bottle is 350 m/sec. Find the length of the air column in the pop bottle. PSYW


Useful Web Links

Closed-End Air Columns (21 seconds)

 

 

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Special thanks to lab assistant Carl Bobis for his assistance in converting quiz to HTML format.

 

© Tom Henderson, 1996-1998


Glenbrook South High School.

Last updated on 10/2/98.