This loop has a circumference approximately equal to one wavelength (however it will also be resonant at odd multiples of a wavelength).
In most of the Americas and the Caribbean, only odd multiples are used.
According to standard acoustic theory a closed end cylindrical pipe will produce only the odd multiples of the fundamental pitch of the pipe.
There are many examples of similar couples of events which combine analogy with contrast and the period between which is an odd multiple of 30 years.
The traditional typographic units are based either on non-metric units, or on odd multiples (such as ) of a metric unit.
For example, the Fourier decomposition of a square wave consists of sine functions, whose frequencies are odd multiples of the fundamental frequency.
(Another way this is often stated is that the color subcarrier frequency is an odd multiple of half the line frequency.)
Standing waves inside the tube will be odd multiples of a quarter-wavelength, with a pressure anti-node at the mouthpiece, and a pressure node at the open end.
More easily, since , must be simply or for α an even or odd multiple of , respectively.
It afflicts every axis order at either even or odd multiples of 90 .