(adsbygoogle = window.adsbygoogle || []).push({}); Need urgent help, beat frequencies and tuning.

1. The problem statement, all variables and given/known data

2. Relevant equations

3. The attempt at a solution

You can see my attempt in the picture. I assume that beat frequencies are the absolute value of the difference between the two. The question asks for how far the tube must be extended to the 3rd decimal but i got 9cm which leads me to think its wrong since it has not decimals at all. Can someone please check my math and confirm its correct or lead me in the right way to get it correct. Thanks

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# Need help, beat frequencies and tuning.

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