A distant galaxy emits light that has a wavelength of 620 nm. On Earth, the wavelength of this light is measured to be 623 nm.
a. Is this galaxy approaching or receding from the earth?
b. Find the speed of the galaxy relative to earth.
c. If this galaxy also emits another EM wave whose wavelength is 1025nm, what wavelength would we expect to measure on Earth for this wave?
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