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??
