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: 1st 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
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