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A signal is beamed in space from earth. It reflects from a space probe revolving around earth. Its echo is recorded after 2.56 s. The speed of the signal in air is $3 ×10^8 m/s$. What is the average radius of the orbit of the probe?

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Ans : (B)
$ 3.84 \times 10^8$m
answered May 30, 2014 by thanvigandhi_1

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