A survey vehicle is on the floor of a cavern. A sensor on the vehicle emits a sound pulse vertically upwards. The pulse reflects from the roof and returns to the sensor.
| quantity | value |
|---|---|
| frequency of sound | 4.0 kHz4.0\ \mathrm{kHz}4.0 kHz |
| wavelength of sound | 0.085 m |
| time for the echo to return | 0.040 s |
| height of the sensor above the floor | 1.2 m |
Calculate the height of the cavern.
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.