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Waves & Sound

Waves & Sound. I. Characteristics of Waves Waves Transverse waves Longitudinal waves Measuring waves. A. Waves. Waves rhythmic disturbances that carry ENERGY through matter or space Medium material through which a wave transfers ENERGY solid, LIQUID , GAS, or combination

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Waves & Sound

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  1. Waves & Sound I. Characteristics of Waves • Waves • Transverse waves • Longitudinal waves • Measuring waves

  2. A. Waves • Waves • rhythmic disturbances that carry ENERGY through matter or space • Medium • material through which a wave transfers ENERGY • solid, LIQUID, GAS, or combination • electromagnetic waves don’t need a medium (e.g. SUNLIGHT)

  3. A. Waves • Two Types: Longitudinal Transverse

  4. B. Transverse Waves • Transverse Waves • medium moves OPPOSITE to the direction of wave motion. Medium Motion of wave

  5. amplitude amplitude B. Transverse Waves corresponds to the amount of ENERGY carried by the wave • Wave Anatomy

  6. C. Longitudinal Waves • Longitudinal Waves (a.k.a. COMPRESSIONAL) • medium moves in the SAME direction as wave MOTION. Medium Motion of wave

  7. __________ C. Longitudinal Waves • Wave Anatomy Amount of compression corresponds to amount of ENERGY AMPLITUDE.

  8. 1 second D. Measuring Waves • Frequency( f ) • # of waves passing a point in 1 sec. • Hertz (Hz)

  9. D. Measuring Waves • Velocity ( v ) • SPEED of a wave as it moves forward • depends on wave type and MEDIUM v = × f v: velocity (m/s) : wavelength (m) f: frequency (Hz)

  10. v f  D. Measuring Waves • EX: Find the velocity of a wave in a wave pool if its wavelength is 3.2 m and its frequency is 0.60 Hz. WORK: v =  × f v = (3.2 m)(0.60 Hz) v= 1.92 m/s GIVEN: v = ?  = 3.2 m f = 0.60 Hz

  11. v f  D. Measuring Waves • EX: An earthquake produces a wave that has a wavelength of 417 m and travels at 5000 m/s. What is its frequency? WORK: f = v ÷  f = (5000 m/s) ÷ (417 m) f= 12 Hz GIVEN:  = 417 m v = 5000 m/s f = ?

  12. Your Turn • An earthquake produces a wave that has a wavelength of 210 m and travels at 7000 m/s. What is its frequency? • Find the velocity of a wave in a wave pool if its wavelength is 6 m and its frequency is 0.90 Hz.

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