1.
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The animation is a slow-motion representation of a a cross section of a sound wave propagating in Lucite. A detector, the orange square, is placed in the pipe and properly measures the pressure (position given in meters and time is given in seconds). What is the speed of the sound wave? Note: The animation runs for 0.1 seconds, press reset to reload the animation. Start
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| 343 m/s |
| 0.35 m/s |
| 3500m/s |
| 1750 m/s |
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2.
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The animation represents a cross section of a sound wave propagating in a very long pipe. A detector, the orange square is placed in the pipe and properly measures the pressure (position given in meters and time is given in milliseconds). Which of the graphs properly represents the displacement of the air molecules in the pipe?
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| Animation 1 |
| Animation 2 |
| Animation 3 |
| Animation 4 |
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3.
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The animation represents a cross section of a three dimensional sound wave propagating away from a source. Compare the sound intensity at x=4 and x=5. Distance is shown in cm and time in millisecond. Start
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| Intensity remains constant. |
| Intensity decreases by a factor or two. |
| Intensity decreases by a factor of four. |
| Insufficient information. The intensity depends on environmental factors. |
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4.
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The above simulation shows a standing wave on a string (position in centimeters and time is in seconds). If this string is on a musical instrument, what wavelength sound is produced by the standing wave? Start
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| 0.04 m |
| 3.43 m |
| 0.0004 m |
| 34300 m |
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5.
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The above simulation shows a standing wave on a stringed musical instrument (position in meters and time is in seconds). If the tension in this string were doubled and the string stayed in its fundamental mode, what frequency sound is produced by the new standing wave? Start
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| 857.5 Hz |
| 100 Hz |
| 70.7 Hz |
| 0.014 Hz |
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6.
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The above simulation shows a superposition of two waves on identical strings (position in meters and time is in seconds). What is the difference in frequency between the two waves? Start
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| 0 Hz |
| 4 Hz |
| 0.25 Hz |
| The answer depends on where along the wave the measurement is made. |
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7.
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Why are there no dead spots in the sound distribution when either the left or the right source is transmitting but there are multiple dead spots when both sources are transmitting?
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| Either source can block the sound wave from leaving the other from transmitting a wave. |
| Wave superposition produces interference effects. |
| Refraction bends the waves. |
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8.
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The animation represents a cross section of a three dimensional sound wave propagating away from a moving source. In which of the animation(s) does the source traveling slower than the speed of sound?
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| Animations 1, 2, 3 |
| Animations 1 and 2 |
| Animations 4 and 5 |
| Insufficient information. |
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9.
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You are standing besides a highway as a police car, with its sirens on, drives by as shown in the animation (position is in meters and time is in seconds). Which of the following animations represents what you would hear?
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| Animation 1 |
| Animation 2 |
| Animation 3 |
| Animation 4 |
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10.
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The animation represents a cross section of a three dimensional sound wave propagating away from a moving source. In which of the animations does the resulting sound wave travel the fastest?
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| Animation 1 |
| Animation 5 |
| All tie |
| Depends on the observer's location |
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11.
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You are standing besides a highway as a police car, with its sirens on, drives by as shown in the animation (position is in meters and time is in seconds). Given the frequency of the siren as 800 Hz, determine the change in frequency you will hear as the police car goes by. Start
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| -24 Hz |
| -46.7 Hz |
| 46.7 Hz |
