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(C) In the modern era,the distance of nearby planets from the Earth is measured using the Radar-echo method. In this method,radio waves are sent from

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Radar-echo method

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(C) In the modern era,the distance of nearby planets from the Earth is measured using the Radar-echo method. In this method,radio waves are sent from the Earth towards the planet,which reflect back after hitting the planet's surface. By measuring the time interval $(t)$ between sending and receiving the signal and knowing the speed of light $(c)$,the distance $(d)$ is calculated using the formula $d = (c 	imes t) / 2$.

Which method is used in the modern era to measure the distance of a nearby planet from the Earth?

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