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I=(P)/(4pi r^(2)) At a large distance ...

`I=(P)/(4pi r^(2))`
At a large distance r from a radio antenna, the intensity of the radio signal I is related to the power of the signal P by the formula above.
For the same signal emitted by a radio antenna, Observer A measures its intensity to be 16 times the intensity measured by Observer B. The distance of Observer A from the radio antenna is what fraction of the distance of Observer B from the radio antenna?

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