Far, far away, a Red Supergiant (wavelength of 685 nm) star suddenly explodes (known as a
supernova). If the supernova was observed on Earth, 5.83x108 lightyears away, how long ago
did the explosion occur? Determine the frequency of the light emitted from the Red Supergiant
before the explosion. Find the observed frequency if the Red Supergiant and the Earth were
moving apart at a speed of 8,850,000 m/s.
Note: 1 year = 365.25 days
c = 3.00 x 108 m/s
Answers: 1
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