Electromagnetic radiation that passes through two closely spaced narrow slits having dimensions roughly similar to the wavelength will show an interference pattern that is a result of constructive and destructive… Standing waves exhibit quantization, since their wavelengths are limited to discrete integer multiples of some characteristic lengths.

The energy of a photon is related to the frequency (or alternatively, the wavelength) of the radiation as E = hν (or E = h c λ ), where h is Planck's constant. Other important wave phenomena include standing waves, periodic oscillations, and vibrations.

standing wave — (also, stationary wave) localized wave phenomenon characterized by discrete wavelengths determined by the boundary conditions used to generate the waves; standing waves are…. energy of a photon — related to the frequency (or alternatively, the wavelength) of the radiation as E = hν (or E = h c λ ), where h is Planck's constant. interference pattern — pattern typically consisting of alternating bright and dark fringes; it results from constructive and destructive interference of waves. electromagnetic radiation — energy transmitted by waves that have an electric-field component and a magnetic-field component.