An electron is accelerated from rest through a potential difference of 1000 volts giving it a kinetic energy of
A)
1.6 × 10-22 eV.
B)
0.001 eV.
C)
1.6 × 10-16 J.
D)
1.6 × 10-22 J.
E)
1.6 × 10-16 eV.
C
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A girl throws a stone from a bridge. Consider the following ways she might throw the stone. The speed of the stone as it leaves her hand is the same in each case, and air resistance is negligible. Case A: Thrown straight up
Case B: Thrown straight down. Case C: Thrown out at an angle of 45° above horizontal. Case D: Thrown straight out horizontally. In which case will the speed of the stone be greatest when it hits the water below? A) Case A B) Case B C) Case C D) Case D E) The speed will be the same in all cases.
An electron, moving south, enters a magnetic field of certain strength. Because of this field the electron curves upward. What is the direction of the magnetic field?
A) downward B) towards the east C) upward D) towards the west E) towards the north
The electric field in the region defined by the y-z plane and the negative x axis is given by E = ?ax, where a is a constant. (There is no field for positive values of x.) As ?x increases in magnitude, relative to V = 0 at the origin, the electric potential in the region defined above is
a. a decreasing function proportional to ?|x2|. b. a decreasing function proportional to ?|x|. c. constant. d. an increasing function proportional to +|x|. e. an increasing function proportional to +|x2|.
Suppose that, through the malicious act of an eight-dimensional alien being, the strong force was suddenly turned off throughout the universe. What would happen almost immediately to atoms?
A) The nuclei of atoms would fall apart. B) Electrons would fall into the nuclei of atoms. C) Atoms would be immediately ionized. D) Nothing; atoms would be unaffected by this change.