1.

A star is moving towards the earth with a speed of \[4.5\times {{10}^{6}}\]m/s. If the true wavelength of a certain line in the spectrum received from the star is\[5890\,\,{AA}\], its apparent wavelength will be about \[[c=3\times {{10}^{8}}m/s]\]                             [MP PMT 1999]

A. \[5890\,\,{AA}\]
B. \[5978\,\,{AA}\]
C. \[5802\,\,{AA}\]               
D. \[5896\,\,{AA}\]
Answer» D. \[5896\,\,{AA}\]


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