Everyday Science
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Medium
Question
The term "blue shift" is used to indicate?
A
Doppler effect in which an object appears bluer when it is moving towards the observer or observer is moving towards the object.
✓ Official correct answer
B
Turning a star from white to blue
C
In future sun would become blue
D
Black hole was blue at its start
Community credibility
Registered members can vote for the answer they believe is correct today and explain why. If the facts change after an election or news event, suggest a new option so others can vote it up.
A
Doppler effect in which an object appears bluer when it is moving towards the observer or observer is moving towards the object.
No member explanations yet for this option.
B
Turning a star from white to blue
No member explanations yet for this option.
C
In future sun would become blue
No member explanations yet for this option.
D
Black hole was blue at its start
No member explanations yet for this option.
Explanation
Blue shift is the Doppler effect when source and observer approach, shifting light toward blue.
Hence the keyed answer is the long Doppler-effect option.
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