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An ambulance is generating a siren sound at a frequency of

`2,400Hz`

. The speed of sound is

`345.0(m)/(s)`

. The observer is traveling at a velocity of

`24.00(m)/(s)`

toward the ambulance and the ambulance is traveling at a velocity of

`24.00(m)/(s)`

away the observer. What is the frequency of the siren perceived by the observer?