Mathematics · Speed, Time and Distance
A laser light beamed at the moon takes 2.56 seconds to return after reflection at the moon's surface. If the speed of light is 3 × 105 km/s, the radius of the lunar orbit around the earth would be:
Verified Solution4 OptionsUpdated: October 2026👁️1 View
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- 12.56 × 105 km
- 21.92 × 105 km
- 37.68 × 105 km
- 43.84 × 105 km✓
Correct answer
3.84 × 105 km
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