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1. Bose Einstein Condensate (bec)

   Linked via "interference fringes"

   Coherence and Matter Waves
   The constituent atoms within the condensate/) share a single macroscopic wavefunction, leading to extreme quantum coherence across the entire cloud. This coherence allows BECs/) to be used as coherent sources of matter waves, analogous to how lasers produce coherent light. [Interference experiments](/entries/i…

2. Thomas Young

   Linked via "interference fringes"

   Young's Double-Slit Experiment
   The demonstration of light interference provided critical evidence supporting the wave model. In his experiments, Young used a single light source passed through a small hole, which then illuminated a screen containing two closely spaced parallel slits. The resulting pattern on the screen consisted of alternating bright and dark bands—interference fringes.
   The mathematical description of the fringe spacing ($s$) is given by: