A geologist sends a sound signal through a layer of granite and then a layer of limestone. The frequency of the signal is 5.0 kHz5.0\ \mathrm{kHz}5.0 kHz in both layers.
A detector is positioned below the two layers.
| rock layer | distance travelled by the signal | wavelength of the signal |
|---|---|---|
| granite | 75 m | 1.00 m |
| limestone | 48 m | 0.80 m |
Calculate the total time taken for the signal to reach the detector.
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.