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EIRP is abbreviated as __________

(a) Effective isotropic radiated power

(b) Effective isotropic radio power

(c) Effective and immediate radiated power

(d) Effective and immediate ratio of power

The question was asked during an interview for a job.

I'd like to ask this question from Free Space Propagation Model in section Mobile Radio Propagation: Large – Scale Path Loss of Wireless/Mobile

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The correct choice is (a) Effective isotropic radiated power

The best I can explain: EIRP stands for Effective Isotropic Radiated Power. It is the amount of power that a theoretical isotropic antenna would emit to produce the peak power density observed in the direction of maximum antenna gain. EIRP also takes into account the losses in transmission line and connectors and includes the gain of the antenna.

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