If a star emitting yellow light is accelerated towards earth, then to an observer on earth it will appear
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C
: In case of astronomical Doppler effect, when source and observer move towards each other then change in frequency 
becomes positive. Thus apparent frequency as observed by observer increases or apparent wavelength decreases,
Therefore, if a star, emitting yellow light, is accelerated towards Earth, then to an observer on Earth it will appear gradually changing to blue. It is known as 'blue sift.
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