A car is driving at a presetly unknown constant velocity while 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 (f. = 130.81 Hz). However, you have perfect pitch and perceive the first note is fo = 145.23 Hz. You measure the sound to be 85.00 dB (decibels), and the car is 20.00 m away from you. you are biking %3D %3D a) What is the speed of the car, and is it traveling towards you or away from you? b) What is the sound intensity, I, at your location? c) What is the power of the sound waves emitted from the speaker? Assume spherical sound waves and 20° C.

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A car is driving at a presetly unknown constant velocity while
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 (f. = 130.81 Hz). However, you have perfect pitch
and perceive the first note is fo = 145.23 Hz. You measure the sound to be 85.00
dB (decibels), and the car is 20.00 m away from you.
you are biking
%3D
%3D
a) What is the speed of the car, and is it traveling towards you or away from
you?
b) What is the sound intensity, I, at your location?
c) What is the power of the sound waves emitted from the speaker?
Assume spherical sound waves and 20° C.
Transcribed Image Text:A car is driving at a presetly unknown constant velocity while 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 (f. = 130.81 Hz). However, you have perfect pitch and perceive the first note is fo = 145.23 Hz. You measure the sound to be 85.00 dB (decibels), and the car is 20.00 m away from you. you are biking %3D %3D a) What is the speed of the car, and is it traveling towards you or away from you? b) What is the sound intensity, I, at your location? c) What is the power of the sound waves emitted from the speaker? Assume spherical sound waves and 20° C.
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