Explanation: A radarpulse, like all radio waves, travels at the speed of light. The given speed is 186,000 statute miles per second. The question asks for the distance traveled in one microsecond. First, convert one microsecond to seconds: 1 microsecond = $1 \times 10^{-6}$ seconds. Next, calculate the distance traveled in statute miles: Distance = Speed $\times$ Time Distance = 186,000 statute miles/second $\times 1 \times 10^{-6}$ seconds Distance = 0.186 statute miles. Finally, convert this distance from statute miles to nautical miles. The conversion factor is 1 nautical mile $\approx$ 1.15078 statute miles (or 1 statute mile $\approx$ 0.868976 nautical miles). Distance in nautical miles = 0.186 statute miles / 1.15078 statute miles/nautical mile Distance $\approx$ 0.1616 nautical miles. Rounding to four decimal places, this matches option A) 0.1614 nautical miles. The other options are incorrect due to errors in unit conversion or calculation.