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Frequency Question

  • #1

Homework Statement


A source of sound waves of frequency 1.0 kHz is traveling through the air at 0.50 times the speed of sound. (a) Find the frequency of the sound received by a stationary observer if the source moves towards her. (b) Repeat if the source moves away from her instead.


Homework Equations


v=0.5V

F01 = fs/1-(vs/v)

F02 = fs/1+(vs/v)

The Attempt at a Solution


I tried plugging in the values that are given to me, but I simply don't obtain the correct results. Please help? Thanks in advance.
 

Answers and Replies

  • #2
rl.bhat
Homework Helper
4,433
5
Show your calculations.
 
  • #3
F01 = fs/1-(vs/v)

F02 = fs/1+(vs/v)

Using these equations, I plugged in:

1/1+(343/171.5) = 3

1/1-(343/171.5) = -1

I'm not sure if I must do something regarding the 1kHz given to me, but neither of both numbers are valid answers.
 
  • #4
rl.bhat
Homework Helper
4,433
5
Fs' = Fs/(1 - Vs/V)
Fs = 1kHz, Vs = 171.5 m/s and V = 343 m/s.
Now try.
 

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