O Levels Physics (5054)•5054/12/M/J/25
Explanation
Light travel time using speed of light formula
Steps:
- Speed of light is 300,000 km/s.
- Average Earth-Sun distance is 150 million km.
- Time = distance / speed = 150,000,000 km / 300,000 km/s.
- Result: 500 seconds.
Why D is correct:
- Formula time = distance / speed of light (c = 3 × 10^5 km/s) yields ~500 s for 1.5 × 10^8 km.
Why the others are wrong:
- A: Underestimates by factor of 1,000; confuses with local speeds like sound.
- B: Underestimates by factor of 100; ignores vast solar distance.
- C: Half the actual time; common miscalculation of distance or speed.
Final answer: D
Topic: The Solar System
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