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For radio transmission in free space, signal reduced proportion to the power is in square of the distance from the source, whereas in wire transmission,

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For radio transmission in free space, signal reduced proportion to the power is in square of the distance from the source, whereas in wire transmission, the attenuation is a fixed number of dB per kilometer. The following table used to show reduction relative to some reference for free space radio and uniform wire. Fill in the missing numbers to complete the table

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