The speed of a radio wave in free space equals the speed of light, approximately how many miles per second?

The speed of a radio wave in free space equals the speed of light, approximately how many miles per second?

• A. 186,000
• B. 299,792
• C. 186,282
• D. 1864

Answer: (A)

Radio waves in free space travel at the speed of light. The speed of light is about 299,792 kilometers per second, which converts to roughly 186,282 miles per second. Since the question asks for an approximate miles-per-second value, a common rounded figure is 186,000 miles per second. The other options aren’t in miles per second (299,792 is kilometers per second), or are far off (1864), while 186,282 is a precise value but the prompt asks for an approximation, so 186,000 is the typical rounded choice.

Radio waves in free space travel at the speed of light. The speed of light is about 299,792 kilometers per second, which converts to roughly 186,282 miles per second. Since the question asks for an approximate miles-per-second value, a common rounded figure is 186,000 miles per second. The other options aren’t in miles per second (299,792 is kilometers per second), or are far off (1864), while 186,282 is a precise value but the prompt asks for an approximation, so 186,000 is the typical rounded choice.