Question: A fire engine sounds its siren as it drives through a neighbourhood at a speed of 21.4 m/s. a)If the apparent frequency of the approaching

A fire engine sounds its siren as it drives through a neighbourhood at a speed of 21.4 m/s.

a)If the apparent frequency of the approaching siren as observed by a child playing in her

yard is 1.45 x 10^3 Hz, what is the siren's actual frequency?

b) What will be the siren's apparent frequency after passing the child and driving away?

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