I passed a motorcycle on the highway going the opposite direction. I know I was doing 125/km/h. I estimated that the frequency of his motor dropped by an entire octave, so that's a doubling of the wavelength.
My intuition is telling me that's extremely unlikely. I can't actually calculate how fast he was going with just that information, can I?
It seems to me, I have to know the absolute frequency of one of those tones, either shifted up or down or unshifted, yes?
I tried to mimic the...