Convert Femtoseconds to Shakes
Convert Femtoseconds (fs) to Shakes (sh) instantly and accurately.
Conversion Formula
sh = fs × 1.000000000e-7
About Femtoseconds
A femtosecond (fs) = 10⁻¹⁵ s - the timescale of molecular vibrations and chemical reactions. Bond stretching: 10-200 fs; bending: 50-500 fs. Ahmed Zewail won the 1999 Nobel Prize in Chemistry for femtochemistry, capturing transition states in real time. Ti:sapphire lasers produce 10-100 fs pulses; LASIK uses 10-100 fs for precise corneal cuts. At 800 nm, one optical cycle = 2.67 fs. Light travels 300 nm in 1 fs. 1 fs = 10⁻¹⁵ 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
| Femtoseconds (fs) | Shakes (sh) |
|---|---|
| 1 fs | 1 × 10-7 sh |
| 2 fs | 2 × 10-7 sh |
| 5 fs | 5 × 10-7 sh |
| 10 fs | 1 × 10-6 sh |
| 25 fs | 2.5 × 10-6 sh |
| 50 fs | 5 × 10-6 sh |
| 100 fs | 1 × 10-5 sh |