The radar signal returned from the object in 0.2 ms. What is the distance to the object?


t = 0.2 ms = 0.0002 seconds – the time interval during which the radar signal returned from the object;

c = 300,000 km / s – the speed of light.

It is required to determine L (km) – the distance to the object.

The signal, released to the object, first goes to it, and then it is reflected and returned back. This means that the signal went to the object over time:

t1 = t / 2 = 0.0002 / 2 = 0.0001 seconds.

Then the distance to the object is equal to:

L = c * t1 = 300000 * 0.0001 = 30 kilometers.

Answer: the distance to the object is 30 kilometers.

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