Evidence that a gas consists mostly of empty space is the fact that:
A. the density of a gas becomes much greater when it is liquefied
B. gases exert pressure on the walls of their containers
C. gases are transparent
D. heating a gas increases the molecular motion
E. nature abhors a vacuum
Ans: A. the density of a gas becomes much greater when it is liquefied
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a. strongly acidic. b. weakly basic. c. strongly basic. d. weakly acidic.
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A. increases the voltage sent to each appliance. B. decreases the current sent to each appliance C. increases the current drawn from the circuit but does not change the current to each appliance.
The overall energy efficiency of a typical automobile is closest to
A) 60%. B) 2%. C) 10%. D) 40%. E) 90%.
Thin Films: Light in a frozen block of ice reflects off the ice-air interface at the surface of the block. What phase shift does it undergo?
A. 0° B. 90° C. 180° D. 270° E. It does not undergo any phase shift.