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Physics for IGCSE & O level - Rays And Waves (Section 11 - No. 39)

What is the speed of light in a vacuum (approximately)?
300,000 km/s
200,000 km/s
150,000 km/s
100,000 km/s

Обяснение

The speed of light in a vacuum is approximately 300,000 km/s.

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