An ultrasound transducer is used to image internal structures in a patient's body.
Explain the purpose of applying a coupling gel to a patient's skin before performing an ultrasound scan.
An ultrasound beam travels through muscle tissue and hits the boundary of a synthetic polymer bone-graft scaffold. Calculate the percentage of the incident intensity that is transmitted across this boundary into the scaffold.
acoustic impedance of synthetic scaffold = 3.15×106 kg m−2 s−13.15 \times 10^6 \text{ kg m}^{-2} \text{ s}^{-1}3.15×106 kg m−2 s−1 density of muscle tissue = 1060 kg m−31060 \text{ kg m}^{-3}1060 kg m−3 speed of ultrasound in muscle tissue = 1580 m s−11580 \text{ m s}^{-1}1580 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.