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Question
How dose the red shift confirm that the universe is expanding?
Options
A.wavelength of light emitted by galaxies appears to decreases
B.wavelength of light emitted by galaxies appears to decrease
C.wavelength of light emitted by galaxies appears to increas to increase
D.none of these
Solution
Red shift means shifting of colours in the spectrum of a moving star towards the red end of the spectrum. It happens when the radiation emitting source goes away from the earth. It is due to Doppler′s effect as we observe of case of sound. The apparent frequency decreases or wavelength increases for a receding source.
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