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Estimate the observed wavelength for the 656 nm line in the spectrum of a star which is 100 million light-years from us.

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Einstein's principle of equivalence:  No experiment can be performed that could distinguish between a uniform gravitational field and an equivalent uniform acceleration. or Gravitational mass is equivalent to inertial mass.


Estimate the observed wavelength for the 656 nm line in the spectrum of a star which is 100 million light-years from us.






 
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