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With what speed should a galaxy move outward with respect to earth so that the sodium-D line at wavelength 5890 Å is observed at 5896 Å ?

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With what speed should a galaxy move outward with respect to earth so that the sodium-D line at wavelength 5890 Å is observed at 5896 Å ?

(1) 306 km/sec

(2) 322 km/sec

(3) 296 km/sec

(4) 336 km/sec

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1 Answer

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by (40.4k points)

Correct option is (1) 306 km/sec

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