For a signal whose fundamental frequency is f, the second harmonic has a frequency 2 f, the third harmonic has a frequency of 3 f, and so on. Let w represent the wavelength of the signal or wave in a specified medium.
Rhodes is a name that came to England in the 11th century wave of migration that was set off by the Norman Conquest of 1066. The Rhodes family lived in Lincolnshire at Rhodes, from whence their name is derived. Anglo-Norman names are characterized by a multitude of spelling variations.
'Alexander' was introduced into England by the Crusaders, who, as the Knights of St.John, used the island of Crete as their base for the many fruitless attempts to conquer the Holy Land. The known forms of the name are Saunder, Sandar, and Sander, whilst Saunders, Sanders, and Sandars, are patronymics. Early examples of the surname recording include William Sandre of Kent in 1316, and Richard Saunder of Stafford in the Subsidy Rolls of that county for the year 1332.