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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 -

    Radius of earth = about 6.4*10^6 meters
    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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