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Math Help - HELP!! Maths question!

  1. #1
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    HELP!! Maths question!

    A cable used to send data has an attenuation where power drops by a factor of 10 every 10 km. If the input power is 1 W, and the receiver can detect signals with a power of 10-4 W or more, what is the longest cable that can be used without a regenerator?
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  2. #2
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    Re: HELP!! Maths question!

    Find the signal power at the receiver if the input power is 1W and the cable length is 10km, 20km, 30km, 40km.
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