Energy–time uncertainty (ΔE Δt ≳ ℏ/2)
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ΔE Δt ≳ ℏ/2
What each symbol means
| Symbol | What it stands for |
|---|---|
| ΔE | Energy uncertainty |
| Δt | Characteristic time/lifetime |
When to use this
Used for natural linewidth, virtual states, lifetime broadening estimates.