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The frequency of light emitted from hydrogen present in the Andromeda galaxy has been found to...

The frequency of light emitted from hydrogen present in the Andromeda galaxy has been found to be 0.10% higher than that from hydrogen measured on earth.(Note: Galaxy is APPROACHING earth) At what speed is this galaxy approaching the earth?

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Answer #1

From the Dopplers effect, Af 0.10%))(3x10s m/s) 0.10 (3x10 m/s V: -3x105 m/s

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