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# Wave Motions &amp; Sound

Wave Motions &amp; Sound. A wave is a wave is a wave !. Wave Motions &amp; Sound. Waves They are an everyday part of our life Hear &amp; See Anatomy of a wave Cycle – from peak to peak Period - # of sec. / cycle Frequency – Number of cycles / sec. Wave Motions &amp; Sound.

## Wave Motions &amp; Sound

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### Presentation Transcript

1. Wave Motions & Sound A wave is a wave is a wave !

2. Wave Motions & Sound • Waves • They are an everyday part of our life • Hear & See • Anatomy of a wave • Cycle – from peak to peak • Period - # of sec. / cycle • Frequency – Number of cycles / sec.

3. Wave Motions & Sound • More Anatomy of a wave • Crest • Trough • Wavelength (cycle)

4. Wave Motions & Sound • Fact: In a wave the medium DOES NOT move • A wave is a transfer of energy • A floating ball on the lake • The Poseidon Adventure – the movie • Wave types • Longitudinal (L-wave) • Matter movement in the same direction as the wave • Transverse (T-wave) • Matter movement that is perpendicular to the direction of the wave

5. Wave Motions & Sound • Wave Medium Travel • Gas • L-wave = Yes, T-wave = No • Liquid • L-wave = Yes, T-wave = No • Solid • L-wave = Yes, T-wave = Yes • A 3rd type of wave • S-wave (surface wave)

6. Wave Motions & Sound • Sound Waves • A medium must be present !!!!! • Something must carry the energy • What about the Moon???? • What can the human ear hear? • We hear L-waves only • 20 – 20,000 Hz • Velocity of sound • 1,087 ft/sec. or 741.13 m/h (@ 0 degrees C)

7. Wave Motions & Sound • Waves reflect & refract • Echo • .10 sec. • Application • Sonar • Radar • “Speed Traps” • Moving Sound • Doppler Effect • A change in wave length due to movement • Change in frequency • Application • Radar gun • Astronomy

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