Sound, Frequency and speed problems

[MikeMike]

You are standing on the sidewalk near a hospital when you hear an ambulance approach.

The frequency changes from XXXHz when ambulance is appropaching to XXXhz when it passes you.

what is speed of ambulance, Sound = 330m/s


An organ pips is closed at one end and open at the other. It is found fundamental freq is XXX Hz. find lengt of pip. Speed of Sound = 330

i need the formulas for these i forget most everything about sound formulas.

 

[MikeMike]

got the second one need the first

 

[PurdueRy]

http://library.thinkquest.org/C006027/html-ver/op-dop.html

 

[MikeMike]

that link still gives me the same issues im having.

i have no clue what the actual freq. of the siren is, nor the speed of the siren...

 

[Syrch]

over my head, sorry man 🙁

 

[PurdueRy]

What is given to you? since you XXX'd out information

 

[MikeMike]

approaches with a freq. of 49 and leaves with freq of 375.

 

[PurdueRy]

Originally posted by: MIKEMIKE
approaches with a freq. of 49 and leaves with freq of 375.

Then the only unknown in that equation is freq. Solve for it. 2 equations 2 unknowns