A fire engine sounds its siren as it approaches you. Rank the Doppler effect you hear from highest to lowest frequency.
(a) The speed of the fire engine is 20 km/h and you are at rest.
(b) The speed of the fire engine is 30 km/h and you are at rest.
(c) The speed of the fire engine is 30 km/h while you drive away from it at 20 km/h.
(d) The speed of the fire engine is 30 km/h while you drive toward it at 20 km/h.
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