Flashcards
4.5.5-Wave-particle duality
Cards in this deck (6)
- 1Wave-particle dualitythe theory that all objects can exhibit both wave and particle properties.
- 2De broglie claimedthat all matter, regardless of its mass, could display wave-like properties.
- 3De Broglie equationEnter text here...
- 4Enter text here...De Broglie'a experiment showed that electrons contain both particle and wave like properties. The cathode in the electron gun is the source of the electrons, these are then accelerated by the anode through a very small hole and hit the thin graphite screen. The maximum diffraction then occurs due to the wavelength of electrons, being very similar to the distance between the atoms in graphite. This causes the electrons to diffract in all directions. This then hits the fluorescent screens and creates bright light in the form of concentric circles. The higher the potential difference, the closer the concentric circles are to each other. Using a large magnet moves the electrons, which shows that you have a charged particle. This all takes place in a closed vacuum, this is so that the electrons do not collide with atoms in the air
- 5Davission and Germer experimentas they increased the accelerating voltage, the rings in the diffraction pattern got bigger showing the wavelength must be getting smaller as the electrons move faster.
- 6—Electron diffraction can be used to determine atomic spacing. Today high-speed electrons can be used to determine the arrangement of atoms of crystalline structures or to measure the diameter of a nucleus.
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- A level Physics (4.5- Quantum Physics ) Flashcards on 4.5.5-Wave-particle duality, created by Ben Geeman on 09/05/2017.
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