de Broglie wavelength of electron from accelerating voltage (λ = h/√(2 m_e e V) for electron from rest through V)
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λ = h/√(2 m_e e V) for electron from rest through V
What each symbol means
| Symbol | What it stands for |
|---|---|
| V | Accelerating potential (V) |
| e | Elementary charge (C) |
| m_e | Electron mass (kg) |
When to use this
Electron starts from rest, non-relativistic KE = eV ≪ m_e c². Relativistic correction needed for very high V (JEE sometimes gives 1506 formula √(1.22/V) nm).