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

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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100 km

40 km

10 000 km

10 km

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