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For a specific wavelength 670 nm of light from a galaxy moving with velocity ν , the observed wavelength is 670.7 nm. The value of v is

1. 3 × 10 8 ms –1
2. 3 × 10 10 ms –1
3. 3.13 × 10 5 ms –1
4. 4.48 × 10 5 ms –1

Correct answer: 3.13 × 10 5 ms –1

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