Every moving object carries a wavelength, λ = h / (m·v). Drag the mass and speed sliders and watch that wavelength shrink against a row of atoms 0.2 nm apart — and watch the diffraction fringes below it vanish once the wave is far finer than the gaps it has to pass through.
Wavelength λ = h / (γ·m·v)
0.123 nm
1.2264e-10 m
Detectable: comparable to atomic spacing.
Momentum p = γ·m·v
5.403e-24
kg·m/s · classical, gamma not applied
Lorentz factor γ = 1 / sqrt(1 − v²/c²)
1.000196
Speed is 1.98% of c, so the relativistic branch is in use.
Particle mass m9.11e-31 kg
Log scale: 1e-31 kg (electron) to 1 kg. Each thumb-width crosses whole decades.
Particle speed v5.93e6 m/s
Log scale: 1 m/s to 2.9e8 m/s (0.967c). Capped below 0.999c.
Planck constant h = 6.62607015e-34 J·s (exact, SI 2019). Speed of light c = 299792458 m/s (exact). Reference atomic spacing d = 0.2 nm.
Tip: below 1% of the speed of light, where no relativistic correction applies, halving either slider doubles the wavelength exactly. Then drag mass to the heavy end and watch the wave collapse below one pixel while the fringes flatten into nothing.