A spectral line of a certain star is observed to be "red shifted" from a wavelength of 500 nm to a wavelength of 1500 nm. Interpreting this as a Doppler effect, the speed of recession of this star is:
A) 0.33c
B) 0.50c
C) 0.71c
D) 0.8c
E) c

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The Answer of A spectral line of a certain star is observed to be "red shifted" from a wavelength of 500 nm to a wavelength of 1500 nm. Interpreting this as a Doppler effect, the speed of recession of this star is:
A) 0.33c
B) 0.50c
C) 0.71c
D) 0.8c
E) c

A Spectral Line of a Certain Star Is Observed to Be