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**Ch. 17 - Waves & Sound I. Characteristics of Waves Waves**

Transverse waves Longitudinal waves Measuring waves

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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. visible light)

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A. Mechanical Waves Two Types: Longitudinal Transverse

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**B. Transverse Waves Transverse Waves**

medium moves perpendicular to the direction of wave motion

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**corresponds to the amount of energy carried by the wave**

B. Transverse Waves Wave Anatomy corresponds to the amount of energy carried by the wave wavelength crests amplitude troughs

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**C. Longitudinal Waves Longitudinal Waves (a.k.a. compressional)**

medium moves in the same direction as wave motion

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**C. Longitudinal Waves Wave Anatomy compression wavelength rarefaction**

Amount of compression corresponds to amount of energy AMPLITUDE.

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**D. Measuring Waves Wave period**

Amount of time for a full wavelength to pass a certain point shorter wavelength shorter period

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**D. Measuring Waves Frequency ( f )**

# of waves passing a point in 1 second Hertz (Hz) 1 second shorter wavelength higher frequency

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**vw = × f D. Measuring Waves Velocity ( vw )**

speed of a wave as it moves forward depends on wave type and medium vw = × f vw: velocity (m/s) : wavelength (m) f: frequency (Hz)

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**D. Measuring Waves f v GIVEN: WORK: v = ? v = × f**

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. GIVEN: v = ? = 3.2 m f = 0.60 Hz WORK: v = × f v = (3.2 m)(0.60 Hz) v = 1.92 m/s v f

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**D. Measuring Waves f v GIVEN: WORK: = 417 m f = v ÷ **

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

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Part I - Characteristics of Waves

Part I - Characteristics of Waves

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