The frequency equals the wave speed divided by the wavelength, so this longest wave corresponds to the lowest note on the instrument: Ab on a Bb saxophone, Db on an Eb saxophone. (See standard note names, and remember that saxophones are transposing instruments, so that the written low Bb3 is actually Ab2 for a tenor saxophone in Bb, Db3 for an alto in Eb, and Ab3 for a soprano in Bb. Hereafter we refer only to the written pitch.)
I deliberatly chopped the quote there, cos of the last sentence. Remember the Tenor plays an octave and a tone (a ninth) below the written pitch.
And this page shows Ab2 as 103.83Hz, as per Dave's Wikipedia quote, as well as showing the written lowest note (Bb3) as 116.54Hz