A-LevelPhysicsMedical physicsFeb/Mar 2018Paper 4 Q510 Marks
(a) Explain the main principles behind the use of ultrasound to obtain diagnostic information about internal body structures. (b) (i) Define specific acoustic impedance. (ii) Two media have specific acoustic impedances of Z₁ and Z₂. The magnitudes of the acoustic impedances may be almost equal or very different. State how these differences affect the intensity reflection coefficient at the boundary between the two media. Z₁ ≈ Z₂ Z₁ » Z₂ or Z₁ « Z₂
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