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A galaxy is moving away from the earth at a speed of 286 kms−1. The shift in the wavelength of a redline at 630 nm is x×10−10m. The value of x to the nearest integer, is______ [Take the value of speed of light c, as 3×108ms−1]

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answer is 6.

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Detailed Solution

According to Doppler effect in light , Δλλ=VC where Δλ is shift in the wavelength Δλ=VCλ ⇒Δλ=286×1033×108×630×10−9 ⇒Δλ=6×10−10m

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