Dismiss Notice
Join Physics Forums Today!
The friendliest, high quality science and math community on the planet! Everyone who loves science is here!

Homework Help: Sum of the two sound waves

  1. Sep 18, 2006 #1
    Hi, I need to determine the sum of the two sound waves and express it in the form y=Csin(kx-wt-"theta") where w is omega. The two waves are

    y=Asin(kx-wt) where w is omega
    y=Bsin(kx-wt-"phi") where w is omega

    I used a trigometric formula and got it to the point where it equals

    y=Asin(kx-wt)+B[sin(kx-wt)cos(phi)-cos(kx-wt)sin(phi)] and I have simplified a little but I cannot get it into the form stated above where y=Csin(kx-wt-theta) Any suggestions?

    As well the question states C depends on A,B and phi, and Theta depends on A, B, and phi as well.

    Thanks for your time
    M Goddard
  2. jcsd
  3. Sep 19, 2006 #2


    User Avatar
    Science Advisor
    Homework Helper

    Hint: Use complex numbers
Share this great discussion with others via Reddit, Google+, Twitter, or Facebook