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Doppler Effect in Light Waves

If a star is ...

Question

If a star is moving towards earth then the spectrum lines are shifted towards

A

yellow

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B

infrared

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C

blue

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D

green

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Solution

The correct option is D blue
Red shift takes place when a star moves away from the earth. Red shift occurs due to Doppler's effect formed in light. The apparent frequency of light is decreased when source is going away from the observer.
Blue shift occurs when the source move towards the observer.

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