The time taken for the radio signal to reach the earth is 9.1 x 10^3 seconds.
Let us recall that radio waves are part of the electromagnetic spectrum. This means that they travel with the speed of light.
The speed of the wave of obtained from the relation;
Speed = Distance/Time
Therefore;
Time = Distance/Speed
Distance = 2.72 x 10⁹ km or 2.72 x 10^12 m
Speed = 3 x 10^8 m/s
Time taken = 2.72 x 10^12 m/3 x 10^8 m/s
= 9.1 x 10^3 seconds.
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