An ultrasound pulse is incident normally at the boundary between muscle tissue (MMM) and a layer of fat tissue (FFF). The physical properties of these tissues are shown in the table below:
| Muscle tissue (MMM) | Fat tissue (FFF) | |
|---|---|---|
| Density | ρ\rhoρ | 1.25ρ1.25\rho1.25ρ |
| Speed of ultrasound | vvv | 1.6v1.6v1.6v |
What percentage of the intensity of the ultrasound is reflected at the boundary?
1.2%1.2\%1.2%
11.1%11.1\%11.1%
23.1%23.1\%23.1%
33.3%33.3\%33.3%
25 exam-style questions on OCR A A Level Physics Medical imaging, covering Using X-rays, Diagnostic methods in medicine, and Using ultrasound. Each one has a worked solution and a mark scheme showing where the marks go.