** Wavelength Revisited**

We now have two expressions for the velocity of sound:

v = f and v = 20.1

therefore

f = 20.1 and = ( in metres)

Example. What is the wavelength of concert A (440Hz) at 20 deg. C?

Calculate what it is at 21 deg.C ( = 0.783m)

Here are some examples of wavelengths at 21 deg. C (294 deg. K):