wavelength= planck's constant/(mass*velocity)
http://chem.libretexts.org/Core/Physical_and_Theoretical_Chemistry/Quantum_Mechanics/02._Fundamental_Concepts_of_Quantum_Mechanics/De_Broglie_Wavelength
(a) If the wavelength of an electron is 5.37 ✕ 10−7 m, how fast is it moving?
(b) If the electron has a speed equal to 3.80 ✕ 106 m/s, what is its wavelength?
What equation should I use?
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