⚛︎ Physics Formula Searcher

de Broglie Wavelength Formula

λ = h / p

What it means

Every moving particle has a wavelength inversely proportional to its momentum — a key idea in quantum mechanics.

Variables

SymbolQuantitySI unit
λwavelengthm
hPlanck constantJ·s
pmomentumkg·m/s

Worked example

Given h = 6.6260e-34 J·s, p = 1.0000e-24 kg·m/s, solve for λ:

λ = 6.6260e-10 m

Solve it instantly — open the calculator →
Related: More modern formulas · Full physics formula sheet · All formulas (search)