Compute the matter-wave wavelength λ = h/p from momentum p, useful for electron-microscope, quantum-mechanics and wave-particle duality wavelength estimates.
物质波的波长与动量关系。
| Item | Formula / Note | Source / Standard |
|---|---|---|
| de Broglie relation | λ = h/p | de Broglie 1924 |
| Non-relativistic | λ = h/√(2mE) | Quantum mechanics |
| Relativistic | p = γm₀v | Relativistic mechanics |
| Electron wavelength | λ(Å) ≈ 12.27/√V | Electron microscopy |
| Thermal neutron | λ ≈1.8 Å at 0.025 eV | Neutron scattering |
| Wave-particle duality | Matter-wave hypothesis verified | Davisson-Germer 1927 |
Constants used on this page and their authoritative sources, for verification and citation
| Constant | Value | Unit | Source |
|---|---|---|---|
| Planck constant h | 6.62607015e-34 | J·s | SI defining constant (exact) |
| Elementary charge e | 1.602176634e-19 | C | SI defining constant (exact) |
| Electron rest mass m_e | 9.1093837015e-31 | kg | CODATA 2018 |
| Atomic mass constant (1 u) | 1.66053906660e-27 | kg | CODATA 2018 |
Note: λ = h/(mv); at relativistic speeds use the relativistic momentum p = γmv instead.