A Police Car Siren Emits a Sound at 600 Hz

question 9

Multiple Choice

A police car siren emits a sound at 600 Hz.If observer A moves toward the source at 50 km/hr,and the police car is traveling toward observer A at 100 km/hr (all speeds relative to the road) ,calculate the siren frequency heard by the observer A (assume the speed of sound in air = 343 m/s) .

• A)626 Hz
• B)600 Hz
• C)679 Hz
• D)577 Hz
• E)970 Hz

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