physics

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Find the length of string and speed of wave in string if frequency of given wave is 850 hz and the wavelength is 0.26m? The string is in a tube that is closed at both ends.

I found the speed using v=freqeuncy*wavelength.
How do i find the length of the srring?

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    If resonating, wouldnt the string length be a multiple of half wavelengths?

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