One light-hour is the distance light travels in one hour. The speed of light is about 300,000 km/s . How far is 1 light-hour?

A) 300 thousand km (300,000, or 3 × 105 km)
B) 1.08 billion km (1,080,000,000, or 1.08 ×109 km)
C) 18 million km (18,000,000, or 1.8 × 107 km)
D) 9.46 trillion km (9,460,000,000,000, or 9.46 × 1012 km)


B

Physics & Space Science

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