Ultraviolet light from a distant star is traveling at 3.0 × 108 m/s. How long will it take for the light to reach Earth if it must travel 4.0 × 1013 km?

Convert the distance to meters: 4.0 × 10^13 km = 4.0 × 10^16 m. Using time = distance ÷ speed gives (4.0 × 10^16 m) ÷ (3.0 × 10^8 m/s) = 1.33 × 10^8 seconds. Dividing by 3,600 seconds per hour gives about 3.7 × 10^4 hours, so the correct choice is C, 3.7 × 10^4 hours.

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