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[" 18.A star,which is emitting radiation...

[" 18.A star,which is emitting radiation at a wavelength "],[" of "5000A" ,is approaching the earth with a velocity "],[" of "1.5times10^(5)m/s" .The change in wavelength of the "],[" radiation as received on the earth is "],[[" (1) "25A," (4) "100A],[" (3) Zero "," (4) "2.5A]]

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