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The interference field near the face of a transducer is often referred to as the ______________

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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 zone

I got this question in my homework.

This intriguing question comes from Pulse Velocity Test in portion Testing of Concrete of Concrete Technology

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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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