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A distant galaxy emits light that has a wavelength of
660.8 nm. On earth, the wavelength of this light is
measured to be 662.8 nm. (a) Decide whether this
galaxy is approaching or receding from the earth. (b)
Find the speed of the galaxy relative to the earth.
(Give your answer to 4 significant digits. Use
2.998 × 108 m/s as the speed of light.)
(a) The galaxy is
(b) Number i
receding
9.0738E
from the eart
Units
m/s v

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