Experiência da dupla fenda de Young
Young's double-slit experiment settled the argument about whether light is a wave. This simulation recreates it, letting you vary the slit spacing and wavelength while the fringe pattern on the screen adjusts in real time.
Como usar esta simulação
- Change the slit separation and the slit-to-screen distance
- Select different wavelengths across the visible spectrum
- Switch between single-slit and double-slit patterns
O que observar
- Fringes spread out when the slits are brought closer together
- Red light gives wider fringe spacing than blue, since spacing scales with wavelength
- The central fringe sits directly opposite the midpoint of the slits and is always bright
A física por trás
Light passing through two narrow slits spreads by diffraction and overlaps beyond them. Bright fringes appear where the path difference is a whole number of wavelengths, giving fringe spacing w = λD/d, with D the slit-to-screen distance and d the slit separation. Only a wave model predicts these fringes; a stream of particles would produce two bright bands.