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Homework Help: Sine wave & reflection question?

  1. Feb 6, 2009 #1
    I seem to recall it is possible to change a wave's frequency, pattern, and amplitude by adding another wave to it.

    Is it possible to add a second wave to a Sine wave to turn it into a cosine wave of the same amplitude and how would you do this? I'm thinking if I had an amplitude 1 for the sinewave, an amplitude 2 cosine wave would wipe out the sine wave and be reduced to a cosine wave. Is there a simpler way of doing this requiring less amplitude?

    As a side note on waves, is there a good place/website to understand the physics behind reflection?
  2. jcsd
  3. Feb 6, 2009 #2


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    This is a question, not "learning materials" so I am moving this to "Introductory Physics".
  4. Feb 6, 2009 #3
    So you think sin(x)+2cos(x) = cos(x)?

    If this were true, then sin(x) = -cos(x) would also be true (which it isn't). What you're probably thinking of is the http://physics.tamuk.edu/~suson/html/4323/super.html.

    I'm not sure what specifically you're looking for in regards to reflection (sound? light? mechanical waves?), but a couple of sites that have been handy for me are hyperphysics and PhET (I seem to recall a simulation or two involving waves/pulses on a string)
    Last edited by a moderator: Apr 24, 2017
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