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Old Jul 19th 2009, 12:45 AM   #1
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Arrow number of beats

two strings of length 51.6 cm & 49.1 cm are tensioned separately by 20 N force. mass per unit length of both the string is same & equal to 1 g/m. when both the strings vibrate simultaneously the no. of beats is :
1. 7
2. 8
3. 3
4. 5
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Old Jul 19th 2009, 10:30 PM   #2
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Please attempt the question and post your attempt, or specify where your difficulty lies. This appears to be a straighforward question.
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Old Sep 14th 2009, 09:28 PM   #3
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Okay so E = 2(pi)^2 pSvf^2A^2
I = the average of P/S = 2(pi)^2vpf^2A^2

I got just S in the end x wave speed. I think this is really wrong. Help please.
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Old Sep 14th 2009, 09:55 PM   #4
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radioheadfan,
I cant see the connection of this post to the original question. Did you post in the wrong place?
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