Physics

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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 !

• Physics -

circumference = 2 pi r
time = distance/speed = 2 pi r/343

• light speed -

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

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