An ultrasound transducer is used to image internal structures in a patient's body.
Explain why a coupling gel is used between the transducer and the patient's skin.
A beam of ultrasound is transmitted from blood into bone. Calculate the percentage of the incident intensity that is transmitted.
acoustic impedance of bone = 6.1 × 106 kg m-2 s-1 density of blood = 1060 kg m-3 speed of ultrasound in blood = 1570 m s-1
12 exam-style questions on AQA A Level Physics Non-ionising imaging (A-level only), covering Ultrasound imaging (A-level only), Fibre optics and endoscopy (A-level only), and Magnetic resonance (MR) scanner (A-level only). Each one has a worked solution and a mark scheme showing where the marks go.