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The little brother of an Army radar operator asked,
"Jim, tell me how does a radar work?"
"The radar transmitter emits brief impulses of electromagnetic waves which are reflected from the target and received by a special receiver. Since the speed at which electromagnetic waves propagate is exactly known and the time they take to travel to the target and back can be determined with a great degree of accuracy it is possible to determine the range to the target as well as the direction to it."
His brother pondered a moment, then said,
"As long as you don't know, Jim, why don't you just say so?"
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