Convert Shakes to Planck Time
Convert Shakes (sh) to Planck Time (t_P) instantly and accurately.
Conversion Formula
t_P = sh × 1.854858440e+35
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.
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.
Quick Reference Table
| Shakes (sh) | Planck Time (t_P) |
|---|---|
| 1 sh | 1.855 × 1035 t_P |
| 2 sh | 3.71 × 1035 t_P |
| 5 sh | 9.274 × 1035 t_P |
| 10 sh | 1.855 × 1036 t_P |
| 25 sh | 4.637 × 1036 t_P |
| 50 sh | 9.274 × 1036 t_P |
| 100 sh | 1.855 × 1037 t_P |