An ambulance moves around a large round-about, with its sirens on. For a person standing at the center of the round-about, the frequency of ambulance siren heard will be:

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An ambulance moves around a large round-about, with its sirens on. For a person standing at the center of the round-about, the frequency of ambulance siren heard will be: Answer: Equal to the actual siren frequency

At the center of a circular path, the ambulance’s speed is always perpendicular to the line joining source and observer, so there is no Doppler shift.