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Speed of refracted waves in different mediums

  • #1

Homework Statement


two vibrating sources emit waves in the same elastic medium. the first source has a frequency of 25 hz, while the frequency of the second source is 75hz. waves from the first source have a wavelength of 6.9 m. they reflect from a barrier back into the original medium, with an angle of relfection of 25 degrees. waves from the second source refreact into a different medium with an angle of incidence of 35 degrees. the speed of the refracted waves is observed to be 96 m/s.




Homework Equations


wat is the is the speed of the reflected waves from the first source in the orignal medium?



The Attempt at a Solution


you cannot tell since it has most likely changed speed after refraction?


Im doing a correspondance course and learning out of a book is retarded.
Can someone explain this to me please?
 

Answers and Replies

  • #2
Redbelly98
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Welcome to Physics Forums. :smile:

There seems to be a lot of unnecessary information given here. But they do tell us what the first wave's frequency and wavelength are. What equation can you use to get the speed?
 
Last edited:
  • #3


Darn it. I posted the right problem but the wrong question. the right question is...

what is the speed of the waves from the second source in the original medium?
 
  • #4
Redbelly98
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It appears there is not enough information to solve this problem, unless we assume the same speed for the two frequencies.

I fail to see the relevance of the 25 degree angle of reflection for the first wave.

Was there a figure accompanying this problem? Perhaps it contains other information, or a better description of the situation.
 
  • #5


Thats all the information given.
No figures.

Its got me all confused.
 
  • #6
Redbelly98
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It seems we should assume the two wave speeds are the same, which is generally true anyway. In that case, my comment in post #2 applies.
 

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