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A radiation known as H? (?=434.1 nm) is used to determine the motion of distant galaxies....

A radiation known as H? (?=434.1 nm) is used to determine the motion of distant galaxies. The wavelength of H? from a galaxy is 462.0 nm, as observed on Earth. (a) What is the minimum speed of the galaxy relative to Earth? (b) Is the galaxy moving away from (enter 0) or approaching (enter 1) Earth?

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Here we apply Doppler shift in wavelength formula.

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