de Broglie waves and Davisson-Germer experiment
Accelerate electrons through V: λ = h/√(2meV) ≈ 1.23/√V nm. Scatter them from a nickel crystal and find the intensity peak at 50 V, φ = 50° that confirms the wave nature of matter (Bragg condition).
About this experiment
| Subject | Physics |
|---|---|
| Class | 12 |
| Chapter | 11. Dual Nature of Radiation and Matter |
| NCERT section | 11.7, 11.8 |
| Level | Advanced (JEE / Olympiad) |
| Time | about 12 minutes |
| Access | Included in a PractiSci plan |
What you do in the lab
Change the controls and watch the physics behave in real time in 3D. Live readouts and graphs show the numbers behind it, and the Learn tab has the theory, procedure, observations and viva questions. Works on a phone or a laptop, in English and Hindi.
Topics: de Broglie · matter waves · Davisson-Germer · electron diffraction · Bragg
More from this chapter
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- Thomson's experiment: specific charge e/m of the electron
- Heisenberg uncertainty principle with single-slit electron diffraction
- X-rays: continuous spectrum, characteristic lines, Moseley and Bragg