An Ambulance Is Generating a Siren Sound at a Frequency

question 20

Multiple Choice

An ambulance is generating a siren sound at a frequency of 2,000 Hz. The speed of sound is 345.0 m/s. The observer and the ambulance are traveling toward each other at a velocity of 24.00 m/s. If the ambulance is stationary, what is the frequency of the siren perceived by the observer?

• A) 2,640 Hz
• B) 2,559 Hz
• C) 2,324 Hz
• D) 2,139 Hz
• E) 2,003 Hz

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