In the case of the xylophone, the strike tone is the fundamental. For chimes, it is not the fundamental, but is related to one of the overtones. The subjective pitch of the strike tone can be explained by analyzing the frequency ratios of the various overtones. The strike tone is then an octave below the first of these or 4.46 times the fundamental frequency. Go here for a more complete discussion of subjective tones.
Procedures Determine the pitch and frequency of each bar of the xylophone in Hz.
This may be done by comparison with the tuning forks. Decide which octave the bars sound. Using the Vernier caliper measure and record the lengths of each bar of the xylophone to the nearest 0.1 mm. Measure and record the thickness of each bar to the nearest 0.01 mm using the micrometer. Record the value of the velocity of sound in the material of the bars.