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Posted by Grace on Sunday, April 11, 2010 at 2:44pm.

Suppose at a concert a singers voice is radio broadcast all the way around the world before reaching the radio you hold to your ear . How long does this take . __ seconds I don't understand thisss ! Help me !

Radius of earth = about 6.4*10^6 meters circumference = 2 pi r time = distance/speed = 2 pi r/343

agrrrh, used sound in air not light 2 pi r / (3*10^8)

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