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Why a siren drops in pitch as it passes: the Doppler effect
An ambulance siren sounds high as it comes at you and drops the moment it passes, yet the driver hears one steady note. The trick is in how crests per second…
Why you hear bass from a speaker too small to make it: the missing fundamental
Your phone speaker is far too small to produce a deep bass note, yet you still hear the bass. The trick is that pitch is not a frequency in the air. It is a…