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 Jan 25th 2015, 11:22 AM #1 Junior Member   Join Date: Jan 2015 Posts: 15 interference of sound Consider the conditions of interference of sound. I think it is not possible, after some interval of time, superposition of waves of sound will cause constructive interference, and after another interval of time it will cause destructive interference. If superposition of waves creates constructive interference once, and phases of waves remain constant, I think for t=1,2,3....... only constructive interference can be found. If once destructive interference is created for any interval of time, or value of time only destructive interference of sound can be found. But for beat, sometimes intensity of sound will be highest, hence the sound can be listened so loudly, and after some interval of time, intensity of sound will be lowest, hence very low sound or no sound can be eared. Am I right? If wrong, please correct me.
Jan 25th 2015, 01:23 PM   #2
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 Originally Posted by Nousher Consider the conditions of interference of sound. I think it is not possible, after some interval of time, superposition of waves of sound will cause constructive interference, and after another interval of time it will cause destructive interference. If superposition of waves creates constructive interference once, and phases of waves remain constant, I think for t=1,2,3....... only constructive interference can be found. If once destructive interference is created for any interval of time, or value of time only destructive interference of sound can be found. But for beat, sometimes intensity of sound will be highest, hence the sound can be listened so loudly, and after some interval of time, intensity of sound will be lowest, hence very low sound or no sound can be eared. Am I right? If wrong, please correct me.
You are a little off. If, say, we have two sources emitting at the same frequency (like two speakers) not pointing in the same direction we will have points of constructive interference and points of destructive interference. The destructive interference does not go away, it is merely a point where one wave has a crest and the other a minimum at the same time. It is the intensity of the sound waves that are measured, not the waves themselves.

-Dan
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