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Sound interference 
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#1
Mar906, 08:44 PM

P: 46

Given for the problem:
A speaker sends out two sound waves with equal Amplitudes but the frequencies are f(1) and f(2) respectively. The motion of sound as w = A * cos(k*x  t*(Omega)). The wave number's and the angular frequency's definition are the same for light. Find for the problem: Show that at a distance x directly in front of the speaker, there is destructive interference between the waves with a frequency f(1)  f(2). My solution so far: w(1) = A * cos((2PI/(Lambda(1))) * x  (2PI * f(1) * t) w(2) = A * cos((2PI/(Lambda(2))) * x  (2PI * f(2) * t) I assume that the final equation will be in the form of: dt = (x / v)  t where v is the speed of sound A little advice please! 


#2
Mar906, 10:53 PM

P: 46

I hope i put this in the right section... It is a Sophmre level physics class...



#3
Mar1006, 07:09 AM

P: 335

Dan 


#4
Mar1006, 11:29 PM

HW Helper
P: 1,117

Sound interference
"Destructive Interference" in this case is timedependent cancellation of the total amplitude (that means add the wave functions), at any location.
This is in contrast to locationdependent cancellation of the total amplitude (an interference pattern) at all time. Choose an xvalue, and add the wave forms ; see when (time) they cancel. 


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