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A radio voice signal from the Apollo crew on the Moon was beamed to a listening crowd from a radio speaker.?
A radio voice signal from the Apollo crew on the Moon was beamed to a listening crowd from a radio speaker. If you were standing 55 m from the loudspeaker, what was the total time lag between when you heard the sound and when the sound entered a microphone on the Moon and traveled to the Earth?
? seconds
Moon -> Earth - the signal was radio, so travelled at the speed of light.
Earth speaker -> ear 55m away - the speed was the speed of sound.
So, figure out the time for that distance (400,000km) at the speed of light (3.0x10^8), and 55m at the speed of sound (approx 1000km/h).
Jaimie Fanatic & Jesse Voorn - Radio Speaker (Original Mix)