1. The problem statement, all variables and given/known data A glass tube has one end dipping into a large container of water and its height above the water is slowly increased until it resonates to a tuning fork of frequency 512Hz. It is then raised further until it resonates to a tuning fork of frequency 280Hz. The distance the tube has been raised in passing from one resonant length to the other is 0.139m. What is the velocity of sound in air at the temperature of the experiment? 2. Relevant equations v=wavelength * frequency wavelength=4L/(2n-1) for open-closed tube, L is length of tube, n is number of segments or number of antinodes. 3. The attempt at a solution The resonation is done in a tube with one end open and one end closed. So the frequency must be odd integer multiples of each other. However 512/280=64/35 suggesting that 512 is an even number in fact 64 times the fundamental frequency. So is that a mistake in the problem?