Double-Slit Experiment

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About this simulation

What students can explore

What happens to the bright bands if you increase the wavelength? Predict, change it, then collect 1,000 detections.
The fine interference bands disappear when path information is recorded. The broad single-slit diffraction envelope remains.
One open slit makes a broad diffraction pattern. The upper and lower slits have the same far-field intensity in this approximation.

Learning objectives

1What happens to the bright bands if you increase the wavelength? Predict, change it, then collect 1,000 detections.
2The fine interference bands disappear when path information is recorded. The broad single-slit diffraction envelope remains.

Questions teachers ask

How does this work?

The two slits contribute probability amplitudes. When the alternatives remain coherent, amplitudes interfere. Each detection is one localized event; many independent photons build the predicted distribution. Recording distinguishable path information removes the interference term in this ideal model. It is a physical interaction, not a person looking. A single open slit still diffracts. This is not a time-dependent wave-equation solver.

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