Answer:
Step-by-step explanation:
Radio waves are electromagnetic waves.
Electromagnetic waves travel in a vacuum at the speed of light, which is:
Therefore, the distance they cover in a time t is
where d is the distance covered.
In this problem, the time elapsed is
t = 100 y
Keeping in mind that
So the time elapsed in seconds is
And therefore, the distance covered by the radio waves in this time is