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A far away galaxy approaches Earth at a velocity v= 0.62c and emits light at a...

A far away galaxy approaches Earth at a velocity v= 0.62c and emits light at a wavelength of 368 nm. What frequency does an observer on Earth measure? (c is the speed of light)

f= 1.68 × 1015 Hz

f= 3.95 × 1014 Hz

f= 8.15 × 1014 Hz

f= 471 Hz

f= 2.72 × 106 Hz

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