An ultrasonic detector is placed against the top of a layered ceramic panel. A pulse travels through the uniform upper layer, reflects at the boundary with the layer below, and returns to the detector. The detector records the following data:
| Measurement | Value |
|---|---|
| Speed of the pulse in the upper layer | 3.2 × 103 m/s |
| Time from sending the pulse to detecting its echo | 3.75 × 10-5 s |
Calculate the thickness of the upper layer.
112 exam-style questions on Edexcel GCSE Physics 4.1 Wave properties, covering 4.1.1 Waves transfer energy and information, 4.1.2 Frequency, wavelength, amplitude, period and wavefronts, 4.1.3 Longitudinal and transverse waves, 4.1.4 The wave speed equations, 4.1.5 Measuring wave velocity, and 4.1.6 Calculating depth or distance from waves. Each one has a worked solution and a mark scheme showing where the marks go.