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9 May, 05:22

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?

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Answers (2)
  1. 9 May, 07:26
    0
    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
  2. 9 May, 08:30
    0
    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
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