PED 332 Sound and Noise Fundamentals Lecture Outlines Quiz
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Questions and Answers

What is the definition of the period (𝜏) for a wave?

  • The sensation produced at the ear by small pressure fluctuations
  • The distance between successive peaks of the wave
  • The time elapsed during one complete cycle for the wave (correct)
  • The speed of sound wave

    • What is the wavelength of a sound wave?

  • The distance between successive peaks of the wave (correct)
  • The sensation produced at the ear by small pressure fluctuations
  • The speed of sound wave
  • The time elapsed during one complete cycle for the wave

    • What parameter is encountered in the analysis of sound waves and is defined by the wave number (𝑘)?

  • The distance between successive peaks of the wave
  • The sensation produced at the ear by small pressure fluctuations
  • Another important parameter in determining the behavior of sound waves (correct)
  • The time elapsed during one complete cycle for the wave

    • What is sound described as in a sound field?

    <p>A perturbation of steady state variables</p> Signup and view all the answers

    What does the speed of sound refer to in the context of a sound wave?

    <p>The velocity at which sound travels through a medium</p> Signup and view all the answers

    What is an important parameter in determining the behavior of sound waves?

    <p>Another important parameter in analyzing sound waves</p> Signup and view all the answers

    What variable is usually used for the description of a sound field?

    <p>Pressure</p> Signup and view all the answers

    What is the minimum sound pressure audible to the young human ear?

    <p>$2 × 10^{-10}$ atmospheres</p> Signup and view all the answers

    At what frequency does the minimum audible level occur for the young human ear?

    <p>3000-4000 Hz</p> Signup and view all the answers

    At what sound pressure level is pain experienced by the normal human ear?

    <p>$60$ Pa</p> Signup and view all the answers

    What type of waves conduct sound to the ear?

    <p>Longitudinal waves</p> Signup and view all the answers

    What is the speed of sound in gases given by?

    <p>$c = γP/ρ = γRT/M$</p> Signup and view all the answers

    In Example (2), what is the molecular weight of air?

    <p>$29$ g/mole</p> Signup and view all the answers

    What does taking a mouthful of helium from a balloon do to your voice?

    <p>Makes it high-pitched</p> Signup and view all the answers

    What is sound intensity defined as?

    <p>Average energy transmitted through a unit area per unit time</p> Signup and view all the answers

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