CAIE A-Level Physics A2 24.1.4 The Specific Acoustic Impedance of a Medium As Z C Topic Practice

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Cambridge International AS & A Level Physics (9702)

12. Motion in a circle

13. Gravitational fields

14. Temperature

15. Ideal gases

16. Thermodynamics

17. Oscillations

18. Electric fields

19. Capacitance

20. Magnetic fields

21. Alternating currents

22. Quantum physics

23. Nuclear physics

24. Medical physics

24.1 Production and use of ultrasound

24.1.1—A piezo-electric crystal changes shape when a p.d. is applied across it and

24.1.2—Ultrasound waves are generated and detected by a piezoelectric transducer

24.1.3—The reflection of pulses of ultrasound at boundaries between tissues can be

24.1.4—The specific acoustic impedance of a medium as Z = ρc

24.1.5—IR / I0 = (Z1 – Z2)2 / (Z1 + Z2)2 for the intensity reflection coefficient

24.1.6—I = I0e–µx for the attenuation of ultrasound in matter

24.2 Production and use of X-rays

24.3 PET scanning

25. Astronomy and cosmology

Practical assessment skills

Mathematical, data, formula and circuit-symbol skills

A-Level/CAIE/Physics//A2/Question Bank/24. Medical physics/24.1 Production and use of ultrasound/24.1.4—The specific acoustic impedance of a medium as Z = ρc

Question 1

[Maximum number: 2]

Define specific acoustic impedance of a medium.

product of density and speed
speed of ultrasound in medium (and density of medium)

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