The wavelength is computed by Bertin's formula (where T is the period in seconds).

• A. <img src="/_files/images/civil-engineering/docks-and-harbours/27-25-24-1.png">
• B. <img src="/_files/images/civil-engineering/docks-and-harbours/27-25-24-2.png">
• C. <img src="/_files/images/civil-engineering/docks-and-harbours/27-25-24-3.png">
• D. <img src="/_files/images/civil-engineering/docks-and-harbours/27-25-24-4.png">