The reflected radar signal returned 0.00004 s after it was emitted by the radar. How far from the radar is the obstacle?
| April 13, 2021 | education
t = 0.00004s.
V = 3 * 10 ^ 8 m / s.
S -?
The locator emits electromagnetic waves that propagate at the speed of light V = 3 * 108 m / s. The electromagnetic wave, which the radar emits, propagates in a straight line in the air, reaches the obstacle and is reflected from it, and returns straight back to the radar. The wave travels a distance equal to two distances from the locator to the object 2 * S.
2 * S = Vw * t.
S = V * t / 2.
S = 3 * 10 ^ 8 m / s * 0.00004 s / 2 = 6000 m = 6 km.
Answer: the obstacle is at a distance of S = 6 km from the locator.
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