A radar signal is reflected from the moon. It is detected after a 2.58 s time lapse between sending and
receiving. How far away in kilometers is the moon?

The distance to the moon is

Explanation:

Here the distance to the moon is half the distance traveled by light (the radar signal) in 2.58 seconds.

Since the speed of light is , the distance traveled by light in 2.58s is

Half of this distance is

which in kilometers is

and it is this distance to the moon.

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amplitude

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