Wave Interference: free physics simulation
Ripple tank with two sources or a double slit: constructive and destructive interference.
▶ Open the simulationFree, no sign-up. Works on phones, tablets and laptops.
The science
When two waves overlap they add together. Where crests meet crests the waves reinforce (constructive interference); where crests meet troughs they cancel (destructive interference). A double slit makes a pattern of bright and dark fringes, the classic evidence that light is a wave.
Bright fringes: path difference = n λ
Things to try
- Move the two sources closer and watch the fringes spread out.
- Increase the wavelength and see the pattern widen.
- Switch to a double slit and compare with two point sources.
Topics covered
ripple tank double slit superposition diffraction light sound water
How to use it
Open the simulation, then change the experiment live with the sliders, checkboxes and buttons in the side panel. Drag objects on screen where it makes sense, and use Pause, Step, Speed and Reset in the bottom bar to study every moment.
Frequently asked questions
What does the Wave Interference simulation show?
When two waves overlap they add together. Where crests meet crests the waves reinforce (constructive interference); where crests meet troughs they cancel (destructive interference). A double slit makes a pattern of bright and dark fringes, the classic evidence that light is a wave.
What is the key equation?
Bright fringes: path difference = n λ
Is the Wave Interference simulation free?
Yes. It runs free in any web browser on phones, tablets and laptops, with no sign-up or download.
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