Physics 112 Quiz 1 Ch 16

9 Questions | Total Attempts: 43

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Physics chapter 16 quiz. Study for test please.


Questions and Answers
  • 1. 
    A source emits a sound of constant frequency, f. If this sound enters an environment where the speed of sound is greater f stays the same and:
    • A. 

      Lambda becomes longer.

    • B. 

      Lambda becomes shorter.

    • C. 

      Lambda stays the same if f is unchanged.

    • D. 

      No. the speed of sound is a "constant" so f must change along with lambda.

    • E. 

      No. the speed of sound, wavelength and frequency will all be unchanged.

  • 2. 
    A singer practicing the vocal scale singing "do, re,mi,fa,so,la,ti,do" produces sounds  
    • A. 

      At progressively longer lambda and lower frequency

    • B. 

      At progressively shorter lambda and lower frequency

    • C. 

      At progressively longer lambda and higher frequency

    • D. 

      At progressively shorter lambda and higher frequency.

    • E. 

      At progressively higher frequencies but constant wavespeed and wavelength.

  • 3. 
    The wavelength emitted during a persons speech depend on several factors, including the dimensions of their mouth and related cavities. if a person has inhaled helium gas, the speed of the sound waves through this helium gas will be > so when they speak, the same wavelengths and this greater sound speed result in speech at frequencies that are     
    • A. 

      Lower than for their normal speech in air

    • B. 

      The same as for their normal speech in air.

    • C. 

      Greater than for their normal speech in air

    • D. 

      Unable to be heard by stationary observers

    • E. 

      More than one of these is correct

  • 4. 
    At a fireworks display an exploding aerial bomb produces a sound intensity of 1.0E-2 w/m at a distance of 100 m from the explosion. the surface area for a sphere is 4pie R^2. what would be the total power output of this explosion, assuming it is uniform and unfocussed.     
    • A. 

      3.2E-7 W

    • B. 

      1.0E-2 W

    • C. 

      3.1E2 W

    • D. 

      1.3E3 W

    • E. 

      None of these

  • 5. 
    To have resonance and a standing wave on the sting of a violin or guitar, for the displacement of the string there should be     
    • A. 

      Nodes at both ends

    • B. 

      Loops or antinodes at both ends

    • C. 

      A loop or antinode at one end and a node at the other end.

    • D. 

      Nodes but no loops or antinodes since this motion would destroy the standing wave.

    • E. 

      None of these

  • 6. 
    While drinking soda from a bottle, you pause periodically and irritate the people around you by blowing across the top of the bottle to make it toot. the more soda you have removed:  
    • A. 

      The lower the pitch of the resulting sound

    • B. 

      The higher the pitch of the resulting sound

    • C. 

      The pitch stays the same the stand waves just get longer

    • D. 

      The pitch stays the same the standing waves just get shorter

    • E. 

      None of these

  • 7. 
    Ultrasound refers to sound waves of very  
    • A. 

      High intensities

    • B. 

      High frequencies

    • C. 

      Long wavelengths

    • D. 

      All of these

    • E. 

      None of these

  • 8. 
    When you hold a seashell to your hear the "sound of the sea" can be heard. this is due to the:  
    • A. 

      Marine environment in which the shell was formed

    • B. 

      Shell blocking all other sound from reaching you.

    • C. 

      Action of this shellular telephone that transmits sounds from distant shores to you.

    • D. 

      Sounds whose intensities are too small to be audible under normal conditions are enhanced by reflection within the shell producing noise like the ocean.

    • E. 

      Sounds whose intensities are too small to be audible under normal conditions are enhanced by transmission through the solid walls of the shell, producing noise like the ocean.

  • 9. 
    The external auditory canal of the human ear is about .027 m long with diamier of .007 m. If this is approximated as atube, closed at one end, with sound waves speed of 344 m/s this tube would have a resonant frequency of:  
    • A. 

      0.027 m

    • B. 

      Less than 10 hz

    • C. 

      3.2E3 hz

    • D. 

      6.4E3 hz

    • E. 

      1.3E4 hz