Question

The “Opportunity” rover that just landed on Mars transmitted music back to Earth. If the distance to Earth at the time was 9x10^7 km and radio waves (a kind of “light”) travel with a speed of 3x10^8 m/s, how long did it take for the signal to reach listeners on Earth?

Answer 1

Answer on Question #62011-Physics-Astronomy-Astrophysics

The "Opportunity" rover that just landed on Mars transmitted music back to Earth. If the distance to Earth at the time was $9 \times 10^{7} \, \text{km}$ and radio waves (a kind of "light") travel with a speed of $3 \times 10^{8} \, \text{m/s}$ , how long did it take for the signal to reach listeners on Earth?

Solution

$$t = \frac {d}{v} = \frac {9 \cdot 1 0 ^ {1 0} m}{3 \cdot 1 0 ^ {8} \frac {\mathrm {m}}{s}} = 3 0 0 s = 5 m i n.$$

Answer: 5 min.

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