## Physics for Scientists and Engineers: A Strategic Approach with Modern Physics (3rd Edition)

$v = 400~m/s$
The image shows the standing wave pattern for the second harmonic. We can find the speed of sound in the tube as: $v = f_2~\lambda_2$ $v = (f_2)~(\frac{2L}{2})$ $v = (500~Hz)(0.80~m)$ $v = 400~m/s$