What was the wavelength emitted by the star

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Astronomers determine that a nearby galaxy is moving toward our galaxy at a speed of 720.0 km/s with respect to the Earth. If Earth receives a wavelength ? = 684.1 nm from a particular star in this nearby galaxy, what was the wavelength emitted by the star? (Give your answer to at least three significant figures.)

Reference no: EM13242462

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