How long does it take for a police radar beam to travel to a car and back if the car is 0.245 mi from the radar unit?

Radar is beam that travel at speed of light.

Given: Speed of light = 186,00 Miles/hour

Distance d = 0.245 Miles

Formula: S = d/t

t = d/S

t = 0.245 Mi / 186,00 Mi/hr

t = 1.32 x 10⁻⁶ hr or 0.005 s

I will convert the unit of distance to SI unit for simplification.

1 mile = 1.6 km

Therefore, 0.245 mile = 0.245*1.6 = 0.392 km = 392 meters

Radio waves travels back after bouncing off from car.

Therefore, total distance traveled by radio waves = 2*392 = 784 meters.

Speed of radio waves = 3*10⁸ m/s

Therefore, time take by radar beam to travel to a car and back = 784/3 * 10⁸

=2.61*10⁻⁶sec