The speed of light in air is:(a) 3 × 108 cm/s (b) 3 × 108 mm/s (c) 3 × 108 km/s (d) 3 × 108 m/s
(d) 3 × 108 m/s
Explanation
The speed of light in vacuum is commonly denoted by 'c'. It is a universal physical constant, with its exact value 299,792,458 m/s (approximately 3,00,000 km/s or 186,000 mi/s).
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