Acoustics Flashcards by danny choi

Q

Formula for speed of sound

A

C = Sqrt ( elasticity / density )

Or

C = f/lambda (wavelength)

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Q

Formula for Impedance

A

Z = density x speed of sound

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Q

Formula for SOUND PRESSURE LEVEL

A

20log(p/2x10^-15)

P = sound pressure of a wave

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Q

Formula for INTENSITY LEVEL

A

IL = 10log(I/10^-12)

I = intensity of a sound wave

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Q

Formula for SOUND POWER LEVEL

A

SPL = 10log(W/10^-12)

W = power

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Q

Formula for Absorption Coefficient

A

(Incident - reflected) / incident

I = sound intensity

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Q

Formula for Insulation

A

20 log (pi.frequency.mass of wall)/pc

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Q

Transmission loss

A

20 log (W.M/2pc)

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