A pulsating star emits light whose frequency in a laboratory is fs = 6.782 x 1014 Hz. The star is in a distant galaxy far from Earth and the same light, 1014 Hz. What is to an observer on Earth, appears to have a frequency of f. = 6.483 the relative speed, Vrel, of this galaxy with respect to Earth in km/s?
A pulsating star emits light whose frequency in a laboratory is fs = 6.782 x 1014 Hz. The star is in a distant galaxy far from Earth and the same light, 1014 Hz. What is to an observer on Earth, appears to have a frequency of f. = 6.483 the relative speed, Vrel, of this galaxy with respect to Earth in km/s?
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Transcribed Image Text:A pulsating star emits light whose frequency in a laboratory is
f = 6.782 x 10¹4 Hz. The star is in a distant galaxy far from Earth and the same light,
to an observer on Earth, appears to have a frequency of f = 6.483 x 10¹4 Hz. What is
the relative speed, Vrel, of this galaxy with respect to Earth in km/s?
Please round your answer to the nearest whole number (integer).
Equations:
fo=f. (1 + r)
fs
where c = 3.0 x 105 km/s and Vrel is their relative velocity.
Hint: use the plus sign if the galaxy is approaching and the minus sign if the galaxy
is receding or moving away.
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