Richard Lamb wrote:

Funny.
I thought frequency was the inverse of wavelength.
x time 1/x = 1 ???

Perhaps you are thinking of a vibrating string as in a guitar where the
frequency is determined by the tension and mass per unit length and wavelengths
have to be integer multiples of the length of the string.

The speed is fixed by the speed of a displacement wave in the string and can be
ignored.

When you use half the string you get twice the frequency.

-- Charlie Springer