The purpose of the third prong on a common electric plug of an appliance is
A) to handle three-phase electricity.
B) to provide an alternate live wire.
C) to connect the appliance to zero ground potential.
D) a substitute for a safety fuse.
E) all of the above
Answer: C
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A. converging lenses B. diverging lenses C. concave lenses D. convex lenses
Which of the following technological advances was not useful in the 1930s to advance the study of nuclear reactions?
A quanton is in a situation where its potential energy decreases to the right. As we go to the right, the wavelength of its energy eigen function
A. Increases. B. Remains the same. C. Decreases. D. Is undefined
A refrigerator has a coefficient of performance equal to 4.2. How much work must be done on the refrigerator in order to remove 250 J of heat from the interior?
A) 60 J B) 120 J C) 250 J D) 480 J E) 1050 J