How long is a RADAR mile in time?

A RADAR mile is defined as the distance that a radar signal travels in one microsecond, which is the time it takes for light (or radar waves) to cover the distance of one nautical mile. Given that there are 2,000 yards in a nautical mile and radar waves travel at the speed of light (approximately 299,792,458 meters per second), we can calculate that it takes about 12.36 microseconds for a round trip for a radar signal to go out to the target and back.

In this case, to find the time for one RADAR mile in a one-way trip, we need to consider that the signal travels to the object and returns, covering the distance of two nautical miles. Therefore, for the radar waves to travel one nautical mile, the time equates to 6.18 microseconds (which is half of 12.36 microseconds, the time for a two-way trip).

This demonstrates that the correct answer reflects the proper calculation of the time it takes for a radar signal to cover the distance of one nautical mile in one direction, corroborating that 6.18 microseconds is the appropriate duration for a RADAR mile in time.