A student stands at the end of a jetty and watches waves on a lake.
The student counts 18 waves passing a post in 60 s.
The distance between one crest and the next crest is 2.5 m.
Calculate the frequency of the waves.
Calculate the speed of the waves.
A boat makes a wave 45 m from the jetty.
Calculate the time taken for this wave to reach the jetty.
Explain why the student counted the waves for 60 s rather than for 10 s.
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.