First we noted that the intensity of a sound wave (in Watts per square meter) falls off as we move farther from the source of the sound. For a sound wave that expands spherically, the intensity will decrease by a factor of 4 if we double our distance from the sound source. If we increase our disatance by a factor of 5 from the sound source, then the intensity will be only 1/25 as much. We related the idea of the intensity of a sound wave to the sound level, which is measured in decibels, dB: We will address Chapter 12 Problems 9, 10, 11, 12, 16, and 18 on Tuesday.
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Physics IIMr. Swackhamer Archives
May 2019
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