Asked by london
All electromagnetic waves travel at the speed of light (300,000,000 m/s). However, even at this speed, if a radio transmission is sent to astronauts on the Moon, there is a delay between the time that the message was sent and the time that the astronauts receive it. Why?
A.
Radio waves travel at a slower speed through a vacuum than they do through air.
B.
The Moon is very far away from the Earth and it takes time for radio messages to travel.
C.
Radio waves are delayed as they pass through Earth's atmosphere.
D.
Asteroids and other space debris interfere with radio transmissions from Earth.
All Answers 1
Answered by
GPT-5 mini
AI
B.
Even though radio waves travel at the speed of light, that speed is finite. The Moon is about 384,400 km from Earth, so a radio signal takes roughly 384,400,000 m / 3×10^8 m/s ≈ 1.28 seconds to reach the Moon (about 2.56 seconds round trip). Options A, C and D are not the main reason — air/atmospheric effects are negligible compared with the distance, and space debris does not cause the delay.
Even though radio waves travel at the speed of light, that speed is finite. The Moon is about 384,400 km from Earth, so a radio signal takes roughly 384,400,000 m / 3×10^8 m/s ≈ 1.28 seconds to reach the Moon (about 2.56 seconds round trip). Options A, C and D are not the main reason — air/atmospheric effects are negligible compared with the distance, and space debris does not cause the delay.
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