A) Wavelength of light emitted by galaxies appears to decrease
B) Wavelength of light emitted by galaxies appears to be the same
C) Wavelength of light emitted by galaxies appears to increase
D) None of the above
Correct Answer: C
Solution :
According to Dopplers 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 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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