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20Q: Acoustics 101 with a Dash of 201

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1.  _________ is a vector quantity, which means that there is both a value and direction of the noise.
  1. Intensity
  2. Sound Level
  3. Amplification
  4. Gain
2.  Reflections that interact with an incident soundwave and add up constructively is a description of:
  1. Particle
  2. Force
  3. Resonance
  4. Dehiscence
3.  In a conventional BTE hearing aid fitting on an adult patient, an expected tubing resonance would be found at:
  1. 250 Hz
  2. 500 Hz
  3. 1000 Hz
  4. 12,000 Hz
4.  A half wavelength resonance would be found in:
  1. BTE hearing aids
  2. Trumpets
  3. Clarinets
  4. Guitars
5.  Impacted cerumen in an ear canal results in a high frequency conductive hearing loss:
  1. when it fully occludes the ear canal from the entrance to the tympanic membrane.
  2. when it occludes the ear canal near the opening (meatus).
  3. when it is lodged against the tympanic membrane.
  4. Never! Impacted cerumen always results in a low frequency conductive loss.
6.  According to Boyle's Law, fitting a hearing aid with an earmold that has a long bore will result in:
  1. higher SPL in the ear canal as compared to an earmold with a short bore.
  2. higher residual volume in the ear canal as compared to an earmold with a short bore.
  3. lower SPL in the ear canal as compared to an earmold with a short bore.
  4. an uncomfortable hearing aid fitting.
7.  Longer tubes have:
  1. lower resonant frequencies compared to shorter tubes.
  2. higher resonant frequencies compared to shorter tubes.
  3. the same resonant frequencies as shorter tubes.
  4. no resonant frequencies.
8.  A side branch resonator is used in automotive applications to:
  1. attenuate sound
  2. amplify sound
  3. increase speed
  4. decrease acceleration
9.  Loudspeakers become more directional in which frequency region?
  1. Low
  2. Mid
  3. High
  4. None of the above - all frequency regions are equally directional.
10.  Musicians' earplugs:
  1. provide only slight low frequency attenuation (up to 25 dB) but up to 40 dB of high frequency attenuation.
  2. use a Helmholtz resonance or a quarter wavelength resonance resulting in a fairly flat frequency response.
  3. provide up to 40 dB low frequency attenuation and up to 25 dB of high frequency attenuation.
  4. are designed to alter the harmonic structure of music.

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