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If light from a galaxy observed on the e...

If light from a galaxy observed on the earth's surface has a red shift, then

A

Galaxy is stationary w.r.t the earth

B

Galaxy is approaching the earth

C

Galaxy is receding from the earth

D

Temperature of galaxy is increasing

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The correct Answer is:
To solve the question regarding the red shift of light from a galaxy observed on the Earth's surface, we can follow these steps: ### Step-by-Step Solution: 1. **Understanding Red Shift**: - Red shift refers to the phenomenon where the light from an object is shifted towards the red end of the spectrum. This occurs when the object is moving away from the observer. 2. **Implication of Red Shift**: - When we observe a red shift in the light from a galaxy, it indicates that the galaxy is receding from us. The greater the red shift, the faster the galaxy is moving away. 3. **Cosmological Context**: - This observation aligns with the cosmological principle, which states that the universe is expanding. As galaxies move away from each other, the light they emit is stretched, resulting in a red shift. 4. **Conclusion**: - Therefore, if light from a galaxy observed on the Earth's surface has a red shift, we can conclude that the galaxy is receding from the Earth. 5. **Choosing the Correct Option**: - Based on the explanation, the correct option would be that the galaxy is receding from the Earth. ### Final Answer: The galaxy is receding from the Earth. ---
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