How does the red shift confirm that the universe is expanding?

wavelength of light emitted by galaxies appears to decrease

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wavelength of light emitted by galaxies appears to be the same

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wavelength of light emitted by galaxies appears to increase

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none of these

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Solution

The correct option is C wavelength of light emitted by galaxies appears to increase
Red shift means shifting of colours in the spectrum of 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 in case of sound. The apparent frequency decreases on wavelength increases for a recreding source.

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Similar questions

Q. The shift caused in visible spectrum of light emitted by galaxies is ______________.

Q. The red shift in the spectral lines of light reaching us from other galaxies implies that these galaxies:

Q. Distant galaxies are seen by astronomers to be red-shifted.
What wave principle explains this, and what does this observation mean about the universe?

Why does the sun appear to be yellow even if the light emitted by it is white, even when there is no material like this glass prism between the light ray and our eyes ?

Q. The distance of a galaxy is

56 \times 10^{25} m

. Assume the speed of light to be

3 \times 10^{8} m s^{- 1}

. Express order of magnitude of time taken by light travelled to the galaxy.

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