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Physics/determinatio of velocity of sound by resonance air column method

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Question
how the end correction is .3d.if the radius is .(d/2).

Answer
The length between nodes is [(1+2n)L/4] where L is the wavelength and n is an integer.  Since an antinode occurs just above the column, a correction has to be made.  It's more accurate to ignore the top and measure the distances between two nodes further down the column.  

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Richard J. Raridon

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I can answer most questions in undergraduate physics courses, including electricity and magnetism, atomic and nuclear, mechanics and optics.

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I have taught undergraduate physics courses

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Sigma Xi, AAAS, SE section of APS

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BA in math, MA in physics, PhD in physical chemistry

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