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.

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

Example #1: Calculate the uncertainty in momentum of a neutron moving at 6.00 x 10^{7} 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 10^{5} m/s has an uncertainty in its velocity of 1.77 x 10^{5} m/s. Determine its uncertainty in position.

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Concept #1: Heisenberg Uncertainty Principle

Concept #2: Heisenberg Uncertainty Principle

Example #1: Heisenberg Uncertainty Principle Example 1

Practice #1: Heisenberg Uncertainty Principle Practice 1

Practice #2: Heisenberg Uncertainty Principle Practice 2

Practice #3: Heisenberg Uncertainty Principle Practice 3

An alpha particle with mass = 6.6 x 10 −24 g moves at a speed of 1.52 x 10 7 ± 0.03 m/s. What is the minimum uncertainty of its position?
a) 2.66 x 10 −10 m
b) 2.66 x 10 −7 m
c) 6.54 x 10 −3 m
d) 8.54 x 10 −3 m
e) 1.75 x 12 −5 m

An electron has an uncertainty in its position of 552 pm. What is the uncertainty in its velocity?

An electron traveling at 3.7 x 10 5 m/s has an uncertainty in its velocity of 1.88 x 10 5 m/s. What is the uncertainty in its position.

According to the Heisenberg uncertainty principle, if the uncertainty in the speed of an electron is 3.5 x 103 m/s, the uncertainty in its position (in m) is at least (mass electron = 9.11 x 10-31 kg) __.
A) 1.7 x 10-8 m
B) 6.6 x 10-8 m
C) 17 m
D) 66 m
E) None of these choices is correct

According to the Heisenberg uncertainity principle , if the uncertainity in the speed of an electron is 3.5 x 103 m/s, the uncertainity in its position (in m) is at least:
A) 66 m
B) 1.7 x 10-8 m
C) 17 m
D) 2.1 x 10-10 m
E) 6.6 x 10-8 m

Using Heisenberg’s uncertainty principle, calculate the uncertainty in the position of (a) a 1.50-mg mosquito moving at a speed of 1.40 m/s if the speed is known to within ∓0.01 m/s

Using Heisenberg’s uncertainty principle, calculate the uncertainty in the position of (b) a proton moving at a speed of (5.00 ± 0.01) x 104 m/s.

Calculate the uncertainty in the position of (a) an electron moving at a speed of (3.00 ∓ 0.01) x 105 m/s

Calculate the uncertainty in the position of (b) a neutron moving at this same speed. (The masses of an electron and a neutron are given in the table of fundamental constants)

To what uncertainty (in m) can the position of a baseball traveling at 45.0 m/s be measured if the uncertainty of its speed is 0.10%? The mass of a baseball is about 0.145 kg.
a. 8.1 x 10-33 m
b. 5.6 x 10-15 m
c. 6.7 x 10-45 m
d. 5.9 x 10-14 m
e. 4.4 x 10-65 m

Why does the uncertainty principle make it impossible to predict a trajectory for the electron?a. Because you cannot know both the position and velocity of the electron simultaneously.b. Because you cannot know both the position and force acting on the electron simultaneously.c. Because you cannot know the velocity of the electron.d. Because you cannot know the force acting on the electron.e. Because you cannot know both the velocity and force acting on the electron simultaneously.f. Because you cannot know the position of the electron.

According to the Heisenberg uncertainty principle, if the uncertainty in the speed of an electron is 3.5 x 103 m/s, the uncertainty in its position (in m) is at least.66 m 17 m 6.6 x 10-8 m 1.7 x 10-8 m 2.1 x 10-10 m

An electron has an uncertainty in its position of 190 pm. What is its uncertainty in its velocity?272 x 103 m/s 1.12 x 105 m/s 521 x 105 m/s 4.21 x 102 m/s 305 x 103 m/s

A student is examining a bacterium under the microscope. The E. coli bacterial cell has a mass of = 0.500 (where a femtogram,fg , is 10-15 g) and is swimming at a velocity of v = 9.00 um/s, with an uncertainty in the velocity of 8.00 %. E. coli bacterial cells are around 1 um (10-6m ) in length. The student is supposed to observe the bacterium and make a drawing. However, the student, having just learned about the Heisenberg uncertainty principle in physics class, complains that she cannot make the drawing. She claims that the uncertainty of the bacterium's position is greater than the microscope's viewing field, and the bacterium is thus impossible to locate.What is the uncertainty of the position of the bacterium? Express your answer numerically in meters.

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