First slide

Huygen's Wave Theory

Question

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

Moderate

A

Wavelength of light emitted by galaxies appears to decrease
B

Wavelength of light emitted by galaxies appears to increase
C

Wavelength of light emitted by galaxies appears to be the same
D

None of the above

Solution

According to Doppler's effect whenever there is a relative motion between a source of light and an observer, the apparent frequency of light received by observer, is different from the true frequency of light emitted by the source. When the distance between the source (galaxy) and observer is increasing, the apparent frequency is decreased and wavelength is increased, i.e., there is a shifting towards red end of the spectrum. Hence, we conclude that universe is expanding.

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