When particles act like waves, they form a circular diffraction pattern after passing through a small aperture.
Elle Degginger/Science Photo Library
A classic quantum experiment showing how particles can behave like waves has been demonstrated for the first time using atoms, something once thought impossible. The discovery could be used to design atomic detectors that can measure gravitational waves, which cannot be detected with current technology.
In 1927, physicist George Paget Thomson showed that electrons passing through a crystal diffract.
Source: www.newscientist.com
