## Question

###### A car is driving at a preserily unknown constant velocity while you are biking towards it at a constant speed 15.00 m/s relative to the stationary ground. Its speakers are playing a favourite song of yours, Also sprach Zarathustra, which you know starts on a pitch of C ( 130.81 Hz) . However, you have perfect pitc and perceive the first note is f 145.23 Hz. You measure the sound to be 85.0 dB (decibels) , and the car is 20.00 m away from you_a) What is the speed of the car, and is it traveling t

A car is driving at a preserily unknown constant velocity while you are biking towards it at a constant speed 15.00 m/s relative to the stationary ground. Its speakers are playing a favourite song of yours, Also sprach Zarathustra, which you know starts on a pitch of C ( 130.81 Hz) . However, you have perfect pitc and perceive the first note is f 145.23 Hz. You measure the sound to be 85.0 dB (decibels) , and the car is 20.00 m away from you_ a) What is the speed of the car, and is it traveling towards you or away from you? b) What is the sound intensity, !, at your location? c) What is the power of the sound waves emitted from the speaker? Assume spherical sound waves and 208 C.

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