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Dee,
> a sine wave is at maximum velocity [at] it's 0 crossing, and minimum velocity at 1/4 wavelength <
Yes, but what Kiwi said is also correct. What our ears respond to is wave pressure, not velocity.
To use your electrical analogy, a device draws the most current - and thus power - at the input voltage peaks. So where the voltage is highest, the most work is being done. Even though the velocity happens to be lowest at that peak.
--Ethan
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