An engineer tests a vibration isolator made from three bonded layers. A sound wave passes through each layer. The source of the sound remains unchanged.
The speeds of sound shown in the table are known to be correct. Exactly one of the wavelength measurements is incorrect.
| layer | speed of sound in the layer in m/s\text{m/s}m/s | measured wavelength in m\text{m}m |
|---|---|---|
| steel plate | 5000 | 0.20 |
| rigid resin | 2500 | 0.10 |
| silicone rubber | 1000 | 0.060 |
Evaluate the wavelength measurements. Identify the incorrect measurement and calculate its correct value.
112 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.