14.1 Sound Waves

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Sound Waves

SOUND
• Longitudinal waves, not transverse waves
• Alternating compressions and rarefactions
• Sound travels faster in solids and liquids than in air
Speed of Sound v = λf          λ = wavelength          f = frequency
Speed of Sound
in a Solid Rod
v = √ Y/ρ          Y = Young's Modulus           ρ = Density
Speed of Sound
in a Fluid
v = √ B/ρ          B = Bulk Modulus               ρ = Density
Speed of Sound
in a Gas
v = √ P/ρ          P = Pressure                     ρ = Density
Speed of Sound
in Air
v = (331 m/s) √ T/273K                   vair,20°C = 343 m/s