Lösningsförslag: Tentamen i Modern Fysik, 5A1246, 2006-06-02

particle.kth.se

Lösningsförslag: Tentamen i Modern Fysik, 5A1246, 2006-06-02

3. A linear beam of particles is normally incident onto a plate with a double-slit and

forms an interference pattern on a screen behind the double-slit. Show that any attempt to

determine (using some microscopic detector/indicator) through which slit any individual

incident particle has passed destroys the interference pattern. For simplicity assume that

the diffraction angles are small. (Hint: recall the Heisenberg microscope gedanken

experiment.) (5p)

Lösning:

4. A particle with energy E is incident onto a barrier of height U such that E

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