1. The problem statement, all variables and given/known data Given that high tide occurs twice each day. What is the tidal frequency in Hz? 2. Relevant equations frequency in Hertz = no. of complete cycles per second 3. The attempt at a solution Since the there is only one wave cycle between 2 high tides Frequency=1/(24x3600) 4. My inquiries The model answer in my workbook is frequency=2/(24x3600). It is very unclear just from the question whether 1 wave or 2 waves are completed. But since it only said "high tide occurs twice each day" and it didn't say if there are 2 low tides or 1 low tide, I personally think it would be reasonable to think only 1 wave cycle occurred in one day. Another question in my workbook that I have similar inquiry with is this: The diagram( a slinky with 5 compressions and 4 rarefactions in between, if anyone wants the diagram I can upload it though I doubt it would be necessary) shows a longitudinal wave traveling along a slinky of length 12cm. If five compressions are produced in each second, calculate the speed of the wave. Since my main trouble with this is the interpretation of the wordings for deducing the frequency, this question can be simplified to: If 5 compressions are produced in each second, what is the frequency of the wave? In alignment to my thinking process for the 1st question, here my way to tackle it would be Frequency= 4/1= 4Hz because there are exactly 4 complete wave cycles produced in each second But sadly, the model answer is frequency=5/1=5Hz. I don't know if my interpretation or concepts have any flaws or errors. Please let me know if I have. This is very important as misinterpretation of wordings in an exam can lead to a heavy deduction of marks, which does not reflect the real ability of the student in physics but in word interpretation in the examiner's way. So, is my answer or the model answer correct?