Science, Tech, Math › Science De Broglie Wavelength Example Problem Finding the Wavelength of a Moving Particle Share Flipboard Email Print It's not hard to calculate wavelength if you know how to use the de Broglie equation. Justin Lewis, Getty Images Science Chemistry Basics Chemical Laws Molecules Periodic Table Projects & Experiments Scientific Method Biochemistry Physical Chemistry Medical Chemistry Chemistry In Everyday Life Famous Chemists Activities for Kids Abbreviations & Acronyms Biology Physics Geology Astronomy Weather & Climate By Todd Helmenstine Todd Helmenstine is a science writer and illustrator who has taught physics and math at the college level. He holds bachelor's degrees in both physics and mathematics. our editorial process Todd Helmenstine Updated June 05, 2019 This example problem demonstrates how to find the wavelength of a moving electron using de Broglie's equation. While an electron has properties of a particle, the de Broglie equation may be used to describe its wave properties. Problem: What is the wavelength of an electron moving at 5.31 x 106 m/sec?Given: mass of electron = 9.11 x 10-31 kgh = 6.626 x 10-34 J·s Solution: de Broglie's equation isλ = h/mvλ = 6.626 x 10-34 J·s/ 9.11 x 10-31 kg x 5.31 x 106 m/secλ = 6.626 x 10-34 J·s/4.84 x 10-24 kg·m/secλ = 1.37 x 10-10 mλ = 1.37 Å Answer: The wavelength of an electron moving 5.31 x 106 m/sec is 1.37 x 10-10 m or 1.37 Å.