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P H Y S I C S Chapter 7: Waves and Vibrations Section 7C: Wave Properties and Sound

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Mechanical Wave A disturbance that travels through a medium i.e. Sound requires medium of air or water

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What is a Wave?

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Mechanical Wave Waves transfer energy and not matter

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Sine Wave Wave motion can be mathematically described by a sine or cosine wave

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Two Types of Waves Transverse – disturbance is perpendicular to motion Longitudinal – disturbance is parallel to motion

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Slinky Demonstration Energy is transported not matter Transverse vs. Longitudinal

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Parts of a Wave Wavelength (λ) – distance in one cycle Amplitude – displacement Crest – high point Trough – low point Note: λ Lambda

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Sound Waves and Tuning Fork Demonstration Frequency Pitch Amplitude Volume Note: Frequency is wave cycles per second (Hz) 512 Hz 1024 Hz 2048 Hz

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Speed of Sound Note: Sound travels faster in solids, liquids and gas respectively TempSpeed -10 o C325 m/s 0 o C331 m/s 10 o C337 m/s 20 o C343 m/s 30 o C349 m/s MediumSpeed Air (20 o C)343 m/s Helium972 m/s Alcohol1,143 m/s Water1,493 m/s Iron5,130 m/s Pyrex Glass5,640 m/s Diamond12,000 m/s

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Wave Speed Equation

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Frequency Equation

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In-Class Problem #1 Determine the (a) number of waves, (b) wavelength, (c) amplitude, (d) frequency, (e) period and (f) wave speed.

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In-Class Problem #1 Determine the (a) number of waves, (b) wavelength, (c) amplitude, (d) frequency, (e) period and (f) wave speed. waves = 2 λ = 0.04 m A = 0.02 m f = 0.4 Hz T = 2.5 s v = 0.016 m/s

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In-Class Problem #2 A toy boat in the ocean rises every 3.0 s as wave crests pass by. The distance between wave crests is 5.0 m. Determine the (a) frequency, (b) period, (c) the wave length and (d) how fast are the waves traveling.

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In-Class Problem #2 A toy boat in the ocean rises every 3.0 s as wave crests pass by. The distance between wave crests is 5.0 m. Determine the (a) frequency, (b) period, (c) the wave length and (d) how fast are the waves traveling. f = 0.33 Hz λ = 5.0 m T = 3.0 s v = 1.65 m/s

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Assignment Problem Set 7C 7C-7D Quiz (Wave Properties and Behavior)

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