A) Decrease in wave length
B) Increase in wave length
C) No change in wave length
D) None of these
Correct Answer: B
Solution :
A redshift occurs whenever a light source moves away from an observer. It happens when light or other electromagnetic radiation from an object is increased in wavelength, or shifted to the red end of the spectrum. When the wavelength is redshirted (i.e., the wavelength is increased to a larger value), it implies that the star is moving away from the observer (or the observer is moving away from the star.
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