Energy and Intensity of Sound Waves Physics Notes - Edubirdie

University:
University of Cambridge
Course:
0625 IGCSE | Physics
Academic year:

2023
Views:

403

Pages:

2
Author:

Deddy A.

Energy & Intensity of Sound Waves I = →energy 1 ΔΕ A At ↓ I = Power Area P A = average I rate at which E flows thru the surface, divided by SA Intensity surface (W/m²) area of a wave Intensity Level in Decibels = 10log( β can be distance ↓ corresponding 10 = 1.0 x 10-12 W/m² intensity (ref. intensity) level (dB) Review logarithms - x=10y = log10 log(ab) log a + log b log(a/b) loga - log b log(a") = nlog a dB relative intensity (intensity level): The intensity of a sound wave, relative to the intensity at the threshold of hearing, I ★ pain threshold @120 dB! 10x Larger 10x Smaller ax = y log (y) = x Number How Many 10s Base-10 Logarithm 1000 1101010 10010(1000) 3 100 10 1 1 × 10 × 10 1 x 10 1 00:0(100) 2 0.1 0.01 10910(10) 1 log:(1)0 110 log10(0-1) 1-10-10 log1(0.01) etc 10:0(0.001)-3 -1 0.001 1101010 -2 The Doppler Effect the change of wave freq. arising from a moving source, a moving observer, or both tntic sound source moviing sound source e.g., car 's honk getting louder as it approaches you, or if you approach it The Observer is Moving Relative to a Stationary Source CASE 1 Stationary Source Os Observer 0 Freq. of source →when both observer source are stationary (vo O and v₁=0), fofs Sofa + observed freq. As of source fofo → when observer is moving away from source, fo decreases The Source is Moving Relative to the Observer CASE 2 the sme proslacing die water was is moving to the nigh λα = λο

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