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Frequency Changes

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Posted by Michael McNeil on September 11, 2001 22:45:00 UTC

The so called Doppler effect was invented in the Victorian era to describe the change in frequency of the noise of an approaching train and the noise of a receding train.

The name of the term has been applied to the so called behaviour of stars but the mechanism is known to be not directly comparable.

The amplitude (is that the term I mean?)changes with the sounds a train produces. An approaching train is almost silent but as it passes it reaches a crescendo that does not quickly fade.

As a mater of fact the distance that a train can be heard from coming or going is almost the same.

When you drop a pebble into a pond the height of the waves first produced is greater than the last to appear. The height of all the waves falls as they spread from the source. The distance between them changes too. This is behaviour of TRANSVERSE waves.

But suppose we are geting longitudinal waves when the the observed stars apear to change there frequency. Are there other and more probable explanations for all this science of astronomy. Is it possible that the behaviour of Cepheid variables and Novas are nothing more than our misunderstanding of the behaviour of light in vast gravitational fields. Suppose that they are finely balanced near the point of "Total Internal Reflection."

Back soon.

Mike.

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