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A spectral line of a certain star is obs...

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

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The correct Answer is:
D
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