Subjects/Basic Physics/SoundSection 14SoundSpeed of soundCopy LaTeXv=λfView detail →Sound intensityCopy LaTeXI=APFor spherical propagationI=4πr2PView detail →Sound intensity levelCopy LaTeXβ=10log10(I0I)withI0=10−12W/m2Unit: decibel (dB).View detail →Doppler effect — general formCopy LaTeXf′=fv∓vsv±voConvention: the sign of the numerator is chosen according to the observer's motion toward/away from the source; that of the denominator according to the source's motion toward/away from the observer.View detail →BeatsCopy LaTeXfbat=∣f1−f2∣View detail →Tube open at both endsCopy LaTeXfn=2Lnv,n=1,2,3,…View detail →Tube closed at one endCopy LaTeXfn=4Lnv,n=1,3,5,…View detail →
Doppler effect — general formCopy LaTeXf′=fv∓vsv±voConvention: the sign of the numerator is chosen according to the observer's motion toward/away from the source; that of the denominator according to the source's motion toward/away from the observer.View detail →