Double slit experiment doesn't work

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SUMMARY

The discussion centers on the challenges of demonstrating the double-slit experiment using ordinary light sources. Participants emphasize that incoherent light, which emits a mixture of wavelengths, fails to produce the expected wave interference pattern. A recommendation is made to utilize a laser pointer, which provides coherent light necessary for observing the interference pattern. The width of the slits and their separation are also critical factors in achieving the desired results.

PREREQUISITES
  • Understanding of wave-particle duality
  • Knowledge of coherent vs. incoherent light sources
  • Familiarity with laser technology, specifically laser pointers
  • Basic principles of light interference
NEXT STEPS
  • Research the principles of wave interference in physics
  • Learn about the characteristics of coherent light sources
  • Explore the setup and execution of the double-slit experiment using lasers
  • Investigate the impact of slit width and separation on interference patterns
USEFUL FOR

Students of physics, educators demonstrating wave phenomena, and hobbyists interested in optical experiments will benefit from this discussion.

itaybrodsky
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I took a piece of carton and cut out to strands in it. When I shine the line through it, it only projects the two strands on the other side. I tried it with every light in my house but it still didn't work. what do I have to do, to create the wave interference pattern on the other side.
Thank you
 
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It's difficult to demonstrate two-slit interference with ordinary light sources because they're incoherent and emit a mixture of wavelengths. Have you tried a laser? A cheap laser-pointer should do the job OK.
 

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