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Once we had this information, we calculated the velocity of the waves using the equation:

v = frequency * wavelength.

These values were then compared to the "actual" speed of sound, as calculated from the equation v = 331.5 +.607(T), where T was 24 Celsius.

So here's my question: The calculated velocity of the first standing wave was smaller than the "actual" velocity. The calculated velocity of the second and third standing waves was BIGGER than the "actual" velocity. What explains this? Can the difference be attributed to human error in measuring the distance between antinodes or is there some physical phenomenon going on?