1. The problem statement, all variables and given/known data Consider an ultrasound beam incident normal to a boundary between two media with the same density, but where the speed of sound in the second medium is 50 percent larger than that in the first. Calculate the ratio between the pressure amplitudes of the incident and reflected waves. 2. Relevant equations Wave velocity c (ms-1) = wavelength λ (m) x frequency f (Hz) p = βcv p = presuure β = density c= speed v= ? (speed as well ? 3. The attempt at a solution Im confused as to what the c and v are in this case. I have tried searching and some places are saying its speed squared. Or have I got the wrong formula and its some derivation. But Im lost. Is there enough info to answer the question ?