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The term ‘Blue Shift’ is used to indicate?

ADoppler effect in which an object appears bluer when it is moving towards the observer or observer is moving towards the object.
BTurning a star from white to blue
CIn future sun would become blue
DBlack hole was blue at its start

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Correct Answer: A: Doppler effect in which an object appears bluer when it is moving towards the observer or observer is moving towards the object.

Explanation: The correct answer is A: Doppler effect in which an object appears bluer when moving towards the observer. 'Blue Shift' refers to the Doppler effect where an object moving toward the observer has its light shifted to shorter (bluer) wavelengths.

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