Physics 212 Lecture: "Sound Waves II." Feb 6, 1998

• Humans do not perceive the intensity of sound waves in a linear fashion
• Everyday sounds cover an enormous span of intensity
• The decibel system measures the logarithmic ratio of two sounds; usually, we pick the threshold of human hearing as the reference intensity
• The Doppler Effect describes the change in frequency of sound waves when there is relative motion between the source and the listener
  • If the two are moving towards each other, frequency increases
  • If the two are moving away from each other, frequency decreases

This lecture discusses material in Chapter 16 of Cutnell and Johnson.

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Copyright © Michael Richmond. This work is licensed under a Creative Commons License.