Test Academy | A radar signal is beamed towards a planet and its echo is received 7 minutes later. If the distance between the planet and the earth is 6.3 x 10¹⁰ m, calculate the speed of the signal. 30x10⁸ ms⁻¹, 300x10⁸ ms⁻¹, 3x10⁸ ms⁻¹, 0.3x10⁸ ms⁻¹

Question

A radar signal is beamed towards a planet and its echo is received 7 minutes later. If the distance between the planet and the earth is 6.3 x 10¹⁰ m, calculate the speed of the signal.

Options :

30x10⁸ ms⁻¹
300x10⁸ ms⁻¹
3x10⁸ ms⁻¹
0.3x10⁸ ms⁻¹

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