Double-Slit Experiment

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.

• 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.

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

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