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A radiation known as Hy (-434.1 nm) is used to determine the motion of distant galaxies. The wavelength of Hy from a galaxy is

A radiation known as Hy (-434.1 nm) is used to determine the motion of distant galaxies. The wavelength of Hy 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 o) or approaching (enter 1) Earth? I initially A) I got 1.92x107 m/s for part A but that answer was X107 B) marked wrong

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