6_Sound_0910 - FREQUENCY OF SOUND SOUND Different...

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1 SOUND Characteristics of Sound FREQUENCY OF SOUND Different frequencies = different pitches high frequency sounds b high pitch low frequency sounds b low pitch Hearing varies with people and age Most adults cannot hear above 15,000Hz Hearing can be damaged by loud noise ULTRASONIC Used to create pictures of organs or an unborn child Used to find cracks in materials (aircraft) Sound 20,000 Hz or more (above human hearing ) Dogs & bats USES
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Infrasonic Sound waves with frequencies below 20 Hz. Below human hearing . Whales, rhinoceroses, & elephants Produced by vibrating source. Ex: vocal cords, guitar string, etc. Vibrating material sends disturbance. Frequency of vibrating source equal to frequency of waves produced. ORIGIN OF SOUND Sound waves are longitudinal Sound waves are mechanical – they require a medium Traveling Sound Can travel through solids, liquids, or gases Speed depends on the medium Which phase is sound the fastest? Slowest? Why can’t sound travel through a vacuum?
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6_Sound_0910 - FREQUENCY OF SOUND SOUND Different...

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