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    Due to the doppler effect? the frequency of waves which sources are moving away from us decrease (wavelength increases).

    Does this mean that when the wave arrives at Earth it has changed. eg a light a wave with the frequency of light changes to a radio wave? Or is that we observe a radio wave that is not really a radio wave?

    cheers
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    (Original post by turn and fall)
    Due to the doppler effect? the frequency of waves which sources are moving away from us decrease (wavelength increases).

    Does this mean that when the wave arrives at Earth it has changed. eg a light a wave with the frequency of light changes to a radio wave? Or is that we observe a radio wave that is not really a radio wave?

    cheers
    Well, if what you observe is a radio wave, then it is a radio wave from your point of view. For another observer it may have different frequency/wavelength, but for you it is a radio wave.

    On the other hand you may want to ask whether for an observer situated at the source of the wave it is the same wave as for the observer on Earth. If the source is moving relative to Earth, then it's the observed wavelengths/frequencies are different for each.

    That said, I doubt that for galaxies Doppler effect could be as strong as to make light waves into radio waves. Usually you hear about red shift, so that the shift is still within relatively small values (as compared to light wave ---> radio wave).
 
 
 
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