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?
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...