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Wave Motions & Sound

Waves are an integral part of our daily lives, encompassing sound and motion. This overview covers the anatomy of waves, including terms like crest, trough, wavelength, and concepts such as frequency and period. Waves emerge in different types, notably longitudinal (L-waves) and transverse (T-waves), with varying behaviors in gas, liquid, and solid mediums. The section also discusses sound waves, their propagation, the role of mediums, and practical applications such as sonar and radar. Explore the fascinating world of waves and their impact on our environment!

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Wave Motions & Sound

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  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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