Register to reply

Sound interference

by affans
Tags: difference, phase
Share this thread:
affans
#1
Aug12-09, 07:26 PM
P: 11
1. The problem statement, all variables and given/known data

Two sound waves, from different sources with the same frequency, 540 Hz, travel in the same direction at 330m/s. The sources are in phase. What is the phase difference of the waves at a point that is 4.40 m from one source and 4.00 from the other.


2. Relevant equations

We know that [tex]\Phi[/tex] = [tex]\Delta[/tex]L / wavelength * (2pi)
We also know when the delta L / wavelentgh is a positive integer value, fully constructive interference occurs.

If delta L/ wavelength is odd integer value then fully destructive interference occurs.

and then you have your regular kinematics, and dynamics eqns.

3. The attempt at a solution

f = 540 Hz, velocity = 330m/s
f[tex]\lambda[/tex] = velocity
and we solve for lamda = 540/330 = 1.64 m

now we plug that into the phase eqn.

[tex]\Phi[/tex] = [tex]\frac{0.40}{1.64}[/tex]

that is equal to 0.2439024...

now i dont know thats my answer, or should i multiply it by 2pi . or what?
Phys.Org News Partner Science news on Phys.org
Experts defend operational earthquake forecasting, counter critiques
EU urged to convert TV frequencies to mobile broadband
Sierra Nevada freshwater runoff could drop 26 percent by 2100
queenofbabes
#2
Aug12-09, 11:20 PM
P: 211
"We know that [tex]\Phi[/tex] = [tex]\Delta[/tex]L / wavelength * (2pi)"

"[tex]\Phi[/tex] = [tex]\frac{0.40}{1.64}[/tex]"

You're missing the 2pi.


Register to reply

Related Discussions
Sound Interference Introductory Physics Homework 1
Sound Interference and Problem Introductory Physics Homework 7
Interference of sound Introductory Physics Homework 2
Sound interference Introductory Physics Homework 3
Sound Interference + Light Introductory Physics Homework 3