Energy Levels: What is the ionization energy of singly-ionized helium, which has 2 protons?
A. 54.4 eV
B. 13.6 eV
C. 27.2 eV
D. 6.80 eV
E. 36.4 eV
Answer: A
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A dc motor is connected to a emf of 12.0 V. The resistance of its windings is 2.0 
At normal operating speed, the motor delivers 6.0 W of mechanical power. What current does it draw at normal operating speed?
A. 6.0 A B. 0.50 A C. 1.0 A D. 3.0 A
The "Cambrian explosion" refers to the
A) great many meteorite bombardments that occurred during that time. B) great diversity of life that blossomed during that time. C) evolution and great diversity of blastoids during that time period. D) numerous volcanic eruptions that took place during that time.
The magnetic field lines inside a bar magnet go in what direction?
A. from south pole to north pole B. from north pole to south pole C. from side to side D. There are no magnetic field lines inside a bar magnet.
Potential Energy: An alpha particle (a helium nucleus, having charge +2e and mass 6.64 × 10-27 kg) moves head-on at a fixed gold nucleus (having charge +79e). If the distance of closest approach is 2.0 × 10-10 m, what was the speed of the alpha particle when it was very far away from the gold? (k = 1/4??0 = 9.0 × 109 N ? m2/C2, e = 1.60 × 10-19 C)
A. 2.3 × 105 m/s B. 4.6 × 105 m/s C. 2.3 × 106 m/s D. 4.6 × 106 m/s