Convert Planck Time to Shakes
Convert Planck Time (t_P) to Shakes (sh) instantly and accurately.
Conversion Formula
sh = t_P × 5.391247000e-36
About Planck Time
The Planck time (t_P) = √(ℏG/c⁵) ≈ 5.391 × 10⁻⁴⁴ s — the time for light to travel one Planck length (~1.616 × 10⁻³⁵ m). Below this scale, general relativity and quantum mechanics both break down; a theory of quantum gravity is needed. No physical process or instrument approaches this timescale — it is a theoretical lower bound. Introduced by Max Planck in 1899. 1 t_P ≈ 5.391 × 10⁻⁴⁴ s.
About Shakes
A shake = exactly 10 ns (10⁻⁸ s) - the informal unit for fission prompt-neutron generation time, coined at Los Alamos during the Manhattan Project (1943-1945). A prompt-neutron generation in a supercritical core takes ~1-10 shakes; a full explosive chain reaction unfolds over ~50-100 shakes. The name alludes to 'two shakes of a lamb's tail'. Still used in reactor physics and weapons-design calculations. 1 shake = 10 ns.
Quick Reference Table
| Planck Time (t_P) | Shakes (sh) |
|---|---|
| 1 t_P | 5.391 × 10-36 sh |
| 2 t_P | 1.078 × 10-35 sh |
| 5 t_P | 2.696 × 10-35 sh |
| 10 t_P | 5.391 × 10-35 sh |
| 25 t_P | 1.348 × 10-34 sh |
| 50 t_P | 2.696 × 10-34 sh |
| 100 t_P | 5.391 × 10-34 sh |