An oceanographer is studying ocean surface waves near a coastal research tower. A vertical measuring scale is painted on one of the tower's support pillars. As waves pass the pillar, the water level rises and falls.

Describe how the oceanographer can determine the frequency of these ocean waves using the setup shown.
Practise Edexcel GCSE Physics Wave properties and behaviour with exam-style questions for Foundation and Higher tier. 100 questions, matched to the Edexcel GCSE Physics (1PH0) specification and written in Paper 1 and Paper 2 style. Every question includes a full worked solution and mark scheme, so you can see where marks are awarded rather than just whether you got the answer right.