Doppler Perfect Pitch
A woman is standing in the sidewalk when a ambulance with the sirens on moving with constant speed starts approaching. Then the ambulance passes the woman and goes away. The woman has perfect pitch and noticed that the pitch of the ambulance siren has lowered a semitone in the chromatic scale after it passed her. If the speed of sound in that place was 340 m/s find the speed of the ambulance in km/h.
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