Lectures on Physics has been derived from Benjamin Crowell's Light and Matter series of free introductory textbooks on physics. See the editorial for more information....

The wavelength of an elephant

What is the wavelength of a trotting elephant?

One may doubt whether the equation should be applied to an elephant, which is not just a single particle but a rather large collection of them. Throwing caution to the wind, however, we estimate the elephant's mass at 103 kg and its trotting speed at 10 m/s. Its wavelength is therefore roughly

Last Update: 2009-06-21