You are running to the east at 4.00 m/s. Ahead of you by 30.0 m is a parked car, with an alarm sounding at 1400 Hz and 0.0400 W. Behind you by 10.0 m is a person singing at 900 Hz as they walk west at 1.50 m/s. You hear the person’s singing at 49.0 dB on this beautiful 23°C day. a) What frequency do you observe for the car siren? b) What is the combined sound level at your location? c) Does the sound level increase or decrease if you continue running for one second? Explain your answer / show your work.

You are running to the east at 4.00 m/s. Ahead of you by 30.0 m is a parked car, with an alarm sounding at 1400 Hz and 0.0400 W. Behind you by 10.0 m is a person singing at 900 Hz as they walk west at 1.50 m/s. You hear the person’s singing at 49.0 dB on this beautiful 23°C day. a) What frequency do you observe for the car siren? b) What is the combined sound level at your location? c) Does the sound level increase or decrease if you continue running for one second? Explain your answer / show your work.

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