Sound

What is the formula for sound intensity measured in decibels? answerdB = 10log(I/10^-12)where I is the intensity of sound in W/m². The hearing threshold for humans is 10^-12 W/m2	What is the equation for the Doppler effect? answerf' = f(C±Vd) / (C±Vs) where f' is the perceived frequency,f is the actual frequency,C is the speed of sound,Vd is the speed of the detector (+ve if going towards the source),Vs is the speed of the source (+ve if going away from detector).
What is the equation for the speed of sound in a fluid? answerv = sqrt(B/density)where B is the bulk modulus	What is the equation for the speed of sound in a solid answerv = sqrt(Y/density)where Y is the Young's modulus
How does temperature affect the speed of sound? answerv is proportional to sqrt T (measured in K).	Velocity of a wave in a taut string is proportional to? answersqrt (tension/[mass/length])