Coherent waves are waves of the same type (e.g. electromagnetic waves) with the same frequency, wavelength and a constant phase difference. Monochromatic light emitted by a laser is coherent and has a single wavelength. White light is made up of waves with a range of...
Progressive waves transfer energy from one place to another. They require a medium to move through (e.g. water or air). Amplitude (A): the distance between the maximum displacement of the wave from the equilibrium position. Wave speed (c): measured in ms-1 Frequency...
