SPM: Sound Interference

I just bought a surround home theatre speaker lately..now watching movie at home is awesome & more comfortable too.. thanx to those engineer who understands well the interference concept..

Now lets analyze the sound interference..all u need is two speakers which produce sound with same frequency (i.e coherent) and separated at distance, a

Ok..most important observation was that..u’ll hear loud & soft sound along the path

Loud = constructive interference

Soft = destructive interference

x = distance between 2 loud sound (or 2 soft sound)

Example:

Example:

Two loud speakers placed 2 m apart are connected to an audio signal generator that is

adjusted to produce sound waves of frequency 550 Hz. The detection of loud and soft

sounds as a person moves along a line is at 4.0 m from the loudspeakers. Distance between two loud places is 1.2 m

a) the wavelength

b) the speed

Tips: 1^st u identify & extract the information given..such as

a = 2 m

f = 550hz

x = 1.2 m

Then apply in equation λ = ax …. u’ll get the wavelength

D

Next use v = f x λ to find the speed..try it out

(Answer: wavelength = 0.6m, speed = 330m/s)

Revise other topics:
Superposition
Light Interference
Water Interference