1. Is this relationship true: Velocity of sound= 1/Density of the medium? Is it dervived from velocity=squareroot of kinetic energy/mass... mass=density.
2. Intensity increaes with Amplitude^2 and f^2 ?? Why?
3. What is the purpose of the pressure pulse in closed pipes and open pipes. Why is this important?
Thanks!
(mechanical) wave velocity in almost all cases is determined by the
MEDIUM. Two properties of the medium determine velocity.
1. Elastic component: speeds up waves
2. Inertial component: slows waves down
(if medium is gas, sound velocity increases with temperature also)
For sound wave, v = sqrt(B/p) where B=bulk modulus (measure of stiffness) and p = density.
So the answer to your first question is that u are correct ONLY in situations where B is a constant. However, both "B/p" contribute to v so you can't just ignore B. For instance, although h20 is more dense that air, sounds travels much faster in water bcos h20's B is much higher than air.
For your second question, I is proportional to both (Af)^2 where A= amplitude and f = frequency. This is from the formula e.g for sound
I= (p*w^2*A^2*v) where p= density, w=2*pi*f, A= amplitude n v=velocity
I really don't understand ur last question, r u talking about a sound wave pressure pulse) in open n closed pipes, and if so is it about harmonics, resonance etc u r referring to??
