The space probe Pioneer 11 was launched April 5, 1973, and reached Jupiter in December 1974, traveling a distance of 998 million km. How long did it take an electromagnetic signal to travel to Earth from Pioneer 11 when it was near Jupiter?

#### Solution:

To do this question, we must know that electromagnetic signals travel at the same speed as light.

The speed of light = 2.998\times 10^8 \frac{m}{s}.

Knowing that, we simply have to divide the distance it took for the signal to travel by the speed of electromagnetic signals.

\dfrac{998\times 10^9\text{m}}{2.998\times 10^8\frac{\text{m}}{\text{s}}}\,=\,3.33\times 10^3 seconds