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Ch.7 - Quantum MechanicsWorksheetSee all chapters

# De Broglie Wavelength

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Sections
Wavelength and Frequency
Speed of Light
The Energy of Light
Electromagnetic Spectrum
Photoelectric Effect
De Broglie Wavelength
Heisenberg Uncertainty Principle
Bohr Model
Emission Spectrum
Bohr Equation
Introduction to Quantum Mechanics
Quantum Numbers: Principal Quantum Number
Quantum Numbers: Angular Momentum Quantum Number
Quantum Numbers: Magnetic Quantum Number
Quantum Numbers: Spin Quantum Number
Quantum Numbers: Number of Electrons
Quantum Numbers: Nodes

The De Broglie Wavelength equation relates wavelength to velocity or speed.

###### De Broglie Wavelength

Concept #1: The De Broglie Wavelength Equation

Example #1: Find the wavelength of a proton with a speed of 6.25 x 105 m/s. (Mass of a proton = 1.67 x 10-27 kg)

Practice: What is the velocity (in m/s) of an electron that has a wavelength of 3.13 x 105 pm? (Mass of an electron = 9.11 x 10-31 kg).

Practice: The faster an electron is moving, the _________ its kinetic energy, and the __________ its wavelength.

Practice: Consider an atom traveling at 1% the speed of light. The de Broglie wavelength is found to be 7.1316 x 10-39 m. Which element is this?