20 10 Ultrasound is used in medicine. (a) What is ultrasound? ................................................................................................................................................... ................................................................................................................................................... .............................................................................................................................................. [2] (b) Explain how ultrasound is used to produce images in body scans. ................................................................................................................................................... ................................................................................................................................................... ................................................................................................................................................... .............................................................................................................................................. [2] (c) Ultrasound can be used to measure blood flow in the body. Write down one other use of ultrasound in medicine. ................................................................................................................................................... .............................................................................................................................................. [1] (d) The diagram represents a longitudinal wave.
A
B
Explain why the distance between A and B is one wavelength. ................................................................................................................................................... .............................................................................................................................................. [1] [Total: 6]
Š OCR 2014