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Ch.7 - Quantum MechanicsWorksheetSee all chapters

# Heisenberg Uncertainty Principle

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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

Heisenberg's Uncertainty Principle tries to explain the potential duality of an electron behaving as either a particle or wave.

###### Heisenberg Uncertainty Principle

Concept #1: Heisenberg Uncertainty Principle

Concept #2: Heisenberg Uncertainty Principle Formula

Example #1: Calculate the uncertainty in momentum of a neutron moving at 6.00 x 107 m/s. The mass of a neutron is 1.67510 x 10-27 kg.

Practice: To what uncertainty (in m) can the position of a baseball traveling at 51.0 m/s be measured if the uncertainty of its speed is 0.12%? The mass of the baseball is 150 g.

Practice: An electron with a mass of 9.11 x 10-31 kg has an uncertainty in its position of 630 pm. What is the uncertainty in its velocity?

Practice: A proton with a mass of 1.67 x 10-27 kg traveling at 4.7 x 105 m/s has an uncertainty in its velocity of 1.77 x 105 m/s. Determine its uncertainty in position.