Atoms of materials that are good conductors of electricity have
A. only electrons, and so these electrons are easily moved.
B. mostly protons; thus, the negative charges jump easily from atom to atom.
C. outer electrons which are loosely bound and thus easily moved.
D. no electrons; thus, any that are given to them are easy to move about.
Answer: C
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An initially uncharged parallel plate capacitor of capacitance C is charged to potential V by a battery. The battery is then disconnected. Which statement is correct?
a. There is no charge on either plate of the capacitor. b. The capacitor can be discharged by grounding any one of its two plates. c. Charge is distributed evenly over both the inner and outer surfaces of the plates. d. The magnitude of the electric field outside the space between the plates is approximately zero. e. The capacitance increases when the distance between the plates increases.
In nuclear fusion,
A. many radioactive nuclei decay at once. B. the temperatures required are so high that it has never been accomplished on Earth. C. two smaller nuclei combine to form a larger nucleus. D. a large nucleus splits into smaller fragments.
The orbits of the electrons in the hydrogen atom
are a)evenly spaced. b)characterized by a principal quantum number. c)always smaller than that of the ground state. d)all at the same energy level within a given atom.
Resistors in Combination: Four unequal resistors are connected in series with each other. Which one of the following statements is correct about this combination?
A. The equivalent resistance is equal to that of any one of the resistors. B. The equivalent resistance is equal to average of the four resistances. C. The equivalent resistance is less than that of the smallest resistor. D. The equivalent resistance is less than that of the largest resistor. E. The equivalent resistance is more than the largest resistance.