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11 True/False questions

  1. Subjective TonesTones that do not exist in the environment but by forcing parts of the ear into non-linear vibration, are created within the ear itself.

          

  2. RefractionThe bending of wave fronts as they pass through media having unequal or varying density.

          

  3. DiffusionThe dissipation of sound energy or weakening of wave trains as they travel through a medium.

          

  4. DiffractionThe bending of wave fronts as they pass through media having unequal or varying density.

          

  5. AbsorptionThe trapping of sound waves in fibrous or porous materials which weakens the wavefront by reflecting and diffusing sound energy.

          

  6. Difference tonesThe periodic reinforcement and cancellation of two wave trains with frequencies further apart than 20Hz. May be perceived as a third tone.

          

  7. InsulationPreventing sound waves from traveling through physical barriers. This may be accomplished by various combinations of reflection, absorption, diffusion, or by creating a barrier that will not transmit vibration.

          

  8. ReverberationThe perceived phenomenon of multiple echoes mixing with the primary sound.

          

  9. Summation tonesSubjective tones produced by the ear that are perceived as the sum of two external frequencies. These are heard best when they occur near the middle of the audible frequency spectrum.

          

  10. Wave FrontsThe periodic reinforcement and cancellation of two wave fronts with frequencies closer together than 20Hz.

          

  11. BeatsThe bending of wave fronts as they pass through media having unequal or varying density.