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From a vantage point very close to the track at a stock car race, you hear...

From a vantage point very close to the track at a stock car race, you hear the sound emitted by a moving car. You detect a frequency that is 0.841 times smaller than that emitted by the car when it is stationary. The speed of sound is 343 m/s. What is the speed of the car?

The linear density of the A string on a violin is 2.36 × 10-4 kg/m. A wave on the string has a frequency of 552 Hz and a wavelength of 48.8 cm. What is the tension in the string?

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Answer #1

From the formula for Doppler shifted frequency in the case of a moving source is
   
where, c is the speedof sound.
So, putting the given values, we get
  



2)
  
The velocity of sound in the string
  
And the velocity of wave in the string is given by ( T is the tension in the string )
  

So,
  

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