Answer: 2.56
Step-by-step explanation:
Given: Radio waves travel at the speed of light, approximately 300,000,000 m/s.
i.e. Speed = 300,000,000 m/s
Distance from Earth to the Moon= 384,000 km
Since 1 km = 1000 m
Then , Distance from Earth to the Moon= 384,000,000 m
Distance from Earth to the Moon and back = 2(384,000,000)=768 ,000,000 m
The formula we use here :
i.e.
Hence, it will take 2.56 seconds for a radio message to travel from the Earth to the Moon and back.