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    rawadhamwi's Avatar
    rawadhamwi Posts: 8, Reputation: 1
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    #1

    Mar 8, 2008, 08:27 AM
    Removing light
    If I have a light of frequency "x" and a generate another light of freuency "-x" and the 2 waves are superposed. Does the 2 waves cancel each other or does that light disappear?
    Thank you.
    Capuchin's Avatar
    Capuchin Posts: 5,255, Reputation: 656
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    #2

    Mar 8, 2008, 08:33 AM
    You can't have a negative frequency O_o
    rawadhamwi's Avatar
    rawadhamwi Posts: 8, Reputation: 1
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    #3

    Mar 9, 2008, 12:27 AM
    Not negative but opposite
    Capuchin's Avatar
    Capuchin Posts: 5,255, Reputation: 656
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    #4

    Mar 9, 2008, 12:32 AM
    You mean pi radians out of phase, but the same frequency?

    The resultant wave is still there, it just has zero net amplitude.
    rawadhamwi's Avatar
    rawadhamwi Posts: 8, Reputation: 1
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    #5

    Mar 9, 2008, 12:42 AM
    If the amplitude is 0, does the light disappears like sounds? If no, please tell me why?
    Thanks
    Capuchin's Avatar
    Capuchin Posts: 5,255, Reputation: 656
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    #6

    Mar 9, 2008, 12:54 AM
    The light is not observable, but it is still there. Sound does not disappear when it is destructively interfering either - it's just that one wave is counteracted by another.

    The NET amplitude is zero, but the individual waves still have amplitude and still exist.
    Benjimeister's Avatar
    Benjimeister Posts: 83, Reputation: 6
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    #7

    Mar 10, 2008, 11:57 PM
    Imagine having two jets of water in your face, one that's scalding hot and one that's ice cold. In the end, you get a face full of warm water, but the water is still there. Eh?
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