Lecture_27_PPT

Lecture_27_PPT - Chapter 17 Sound Waves What is Sound?...

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Chapter 17 Sound Waves
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What is Sound? z Sound is vibration transmitted through a solid, liquid, or gas; particularly, sound means those vibrations composed of frequencies capable of being detected by ears
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Introduction to Sound Waves z They travel through any material medium z Sound waves are longitudinal waves as transmitted through gases or liquids z Through solids, however, it can be transmitted as both longitudinal and transverse waves z The speed of the wave depends on the properties of the medium
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Categories of Sound Waves z Audible waves are within the sensitivity of the human ear. Range is approximately 20 Hz to 20 kHz Audible sound
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Categories of Sound Waves z Infrasonic waves have frequencies below the audible range z Whales, elephants, hippopotamuses, crocodiles, birds and giraffes are known to use infrasound to communicate over distances. z Naturally from tornado, surf, earthquakes, volcanoes, waterfalls, calving of icebergs, aurora, lightning.
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Categories of Sound Waves z Ultrasonic waves have frequencies above the audible range z Bats (100kHz), Dogs, Dolphins and whales z Applications Ultrasonic Imaging Ultrasonic cleaning SONAR - navigation and ranging
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Speed of Sound Waves v z The speed of all mechanical waves follows a general form: elastic property inertial property v =
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Speed of Sound Waves through Solid Medium B v ρ = k σ z The spring constant is k z The cross-section density is
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Lecture_27_PPT - Chapter 17 Sound Waves What is Sound?...

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