A car is driving at a presently 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 favorite song of yours, Also sprach Zarathustra, which you know starts on a pitch of C (fs = 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. a) What is the speed of the car, and is it traveling towards you or away from you? b) What is the sound intensity, l, at your location? c) What is the power of the sound waves emitted from the speaker? Assume spherical sound waves and 200 C.
Interference of sound
Seiche
A seiche is an oscillating standing wave in a body of water. The term seiche pronounced saysh) can be understood by the sloshing of water back and forth in a swimming pool. The same phenomenon happens on a much larger scale in vast bodies of water including bays and lakes. A seizure can happen in any enclosed or semi-enclosed body of water.
A car is driving at a presently 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 favorite song of yours, Also sprach Zarathustra, which you know starts on a pitch of C (fs = 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.
a) What is the speed of the car, and is it traveling towards you or away from you?
b) What is the sound intensity, l, at your location?
c) What is the power of the sound waves emitted from the speaker?
Assume spherical sound waves and 200 C.
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