A student measured the frequency of ripples on a pond by counting how many wave crests passed a fixed marker in 30 seconds.
Explain why this manual counting method would not be suitable for measuring the frequency of an ultrasound wave used in a medical scan.
35 exam-style questions on Edexcel GCSE Physics 4.3 Sound, ultrasound and infrasound, covering 4.3.1 Sound waves, vibrations and the human ear, 4.3.2 Ultrasound and infrasound, 4.3.3 Uses of ultrasound and infrasound, and 4.3.4 Sound waves passing between media. Each one has a worked solution and a mark scheme showing where the marks go.