An ultrasonic level sensor sends a pulse through a polymer window and into oil. The crystal in the sensor completes 18 000 18\,000\,18000 oscillations in 0.60 s.
| Medium | Speed of sound in m/s\mathrm{m/s}m/s |
|---|---|
| Polymer | 2400 |
| Oil | 1350 |
Calculate the decrease in wavelength when the pulse passes from the polymer into the oil.
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.