Waves in water are transverse. This means that the vibrations causing the waves are perpendicular to the direction of energy transfer. As this little boat demonstrates, you can see that the waves are ...

A ripple tank can be used to measure and calculate frequency, wavelength and the speed of waves on the surface of the water it contains. It is a transparent shallow tray of water, with a light shining ...

Frequency comb: Georg Woltersdorf (left) and his colleague Chris Körner in the lab where they created a spin frequency comb. (Courtesy: Uni Halle/Markus Scholz) A simple method for multiplying the ...