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The interference field near the face of a transducer is often referred to as the ______________(a) Fresnel zone(b) Acoustic impedance(c) Exponential field(d) Phasing zoneI got this question in my homework.This intriguing question comes from Pulse Velocity Test in portion Testing of Concrete of Concrete Technology

Answer»

Right ANSWER is (a) Fresnel zone

The explanation is: Radio FREQUENCY LINE of sight is defined by Fresnel ZONES which are ellipse shaped areas between any two radios.



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