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radar sends electromagnetic waves and it is reflected back by the object such as a plane or a sub and based on the analysis of time and speed of wave we get the position of object. for an example of radar they used radar before pearl harbor and saw many planes, the radar operatiors thought it was a squadron of b-29's returning to base but it ended up being the empire of Japan's zero's (type of lightly armored plane that sacrificed armor for speed,agility,and a better service ceiling (how high a plane can go))

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14y ago

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