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Sound

Sound. Part 1. Intro. Sound is a longitudinal (compression) wave. First , there must be a source for a sound and of course, it must be a vibrating object.

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Sound

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  1. Sound Part 1

  2. Intro • Sound is a longitudinal (compression) wave. • First, there must be a source for a sound and of course, it must be a vibrating object. • Second, you must realize that the wave is transporting vibratory ENERGY and lastly, the sound is detected by an ear or an instrument.

  3. Speed of Sound • Speed of sound--depends on the nature of the medium • Temperature is a huge factor if the medium is a gas since temperature can radically change the density of the gas. • vsound≈(331 + 0.60 T) m/s • T is the temperature in ⁰C

  4. Speed of Sound We will assume 20⁰C and 1atm and will work with 343m/s unless otherwise instructed

  5. Vocabulary • Loudness - relates to the E of the sound wave • Pitch - relates to the frequency of the sound wave • first noted by Galileo; the higher the f, the higher the pitch • Audiblerange - the human ear can hear f’s from 20 Hz to 20,000 Hz • age affects the ability to hear higher frequencies

  6. Vocabulary • Ultrasonic - f above 20,000 Hz • (do not confuse with supersonic - >343m/s) • dogs can hear f in the 50,000 Hz range • bats can hear f in the 100,000 Hz range • Infrasonic - below 20 Hz • Sources include earthquakes, thunder, volcanoes, and waves produced by vibrating heavy machinery. • The latter causes resonant frequencies that can damage internal organs even though the sound cannot be detected!

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