Question:
The mean distance between the sun and the earth in terms of light years is
The mean distance between the sun and the earth in terms of light years is
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The distance between the Sun and the Earth can be expressed as the time light takes to travel that distance, since light moves at a constant speed of about \(3 \times 10^{8}\) m/s.
Updated On: Jun 16, 2026
- 48.311 minutes
- 28.311 minutes
- 18.311 minutes
- 8.311 minutes
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The Correct Option is D
Solution and Explanation
Concept:
The distance between the Sun and the Earth can be expressed as the time light takes to travel that distance, since light moves at a constant speed of about \(3 \times 10^{8}\) m/s.
Step 1:
The mean Sun to Earth distance is about \(1.496 \times 10^{11}\) metres (one astronomical unit).
Step 2:
Time taken by light \(= \dfrac{\text{distance}}{\text{speed of light}} = \dfrac{1.496 \times 10^{11}}{3 \times 10^{8}} \approx 499\) seconds, which is about 8.3 minutes. So in light-travel-time units the distance is roughly 8.311 minutes.
Answer: Option (4) — 8.311 minutes.
The distance between the Sun and the Earth can be expressed as the time light takes to travel that distance, since light moves at a constant speed of about \(3 \times 10^{8}\) m/s.
Step 1:
The mean Sun to Earth distance is about \(1.496 \times 10^{11}\) metres (one astronomical unit).
Step 2:
Time taken by light \(= \dfrac{\text{distance}}{\text{speed of light}} = \dfrac{1.496 \times 10^{11}}{3 \times 10^{8}} \approx 499\) seconds, which is about 8.3 minutes. So in light-travel-time units the distance is roughly 8.311 minutes.
Answer: Option (4) — 8.311 minutes.
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