Light coming from a star is observed to...

Light coming from a star is observed to have a wavelength of `3737 Å`, while its real wavelength is `3700 Å`. The speed of the star relative to the earth is [Speed of light `3 xx 10^(8) m//s`]

`3 xx 10^(5) m//s`

`3 xx 10^(6) m//s`

`3.7 xx 10^(7) m//s`

`3.7 xx 10^(6) m//s`

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