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What happens when the Doppler effect occurs with electromagnetic waves? Watch

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    I was just reading in my physics text book that light is relative to the observer, and therefore is the observer was moving away from the light source at 90% of light speed, to the observer light would still be moving at 100% speed. Does this mean that light can travel faster then itself? Or is it something to do with perception? Either way, I'm baffled.:confused:
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    Ooh Physics makes me so horny :love:
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    you are confusing TIME dilation with light.
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    In special relativity, velocities don't simply add.
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    This is the basis for understanding
    http://en.wikipedia.org/wiki/Relativ...Doppler_effect
    http://en.wikipedia.org/wiki/Time_dilation
    http://en.wikipedia.org/wiki/Special_relativity
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      The Doppler Effect with light is the explanation for the famous "red shift". This is the effect where light (atomic line spectra) from distant galaxies was found to be of a longer wavelength than expected. This led to the discovery that the distant galaxies were all moving away from Earth, and the further away they were, the faster they were moving. This then led to the idea of an expanding universe and subsequently to the Big Bang. There is a corresponding "blue shift" for light sources that are approaching the observer.
     
     
     
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