An extrinsic n-type semiconductor can be made from Group IV germanium by adding impurity atoms of:
(a) Group IV silicon
(b) Group III aluminum
(c) Gorup II magnesium
(d) Group V arsenic
(d) Group V arsenic
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Graphical Addition: If 
- 
= 0, then the vectors 
and 
have equal magnitudes and are directed in the same direction.
A. True B. False
Two ice skaters, one with a mass of 45 kg and the other with a mass of 60 kg, push off against one another starting from a stationary position. After they have pushed off, the relative speed at which they separate is 0.600 m/s. What is the speed of the 60-kg skater?
A) 0.343 m/s B) 0.257 m/s C) 0.375 m/s D) 0.750 m/s E) 0.225 m/s
The electric potential at the origin of an xy-coordinate system is 40 V. A -8.0-?C charge is brought from x = +? to that point. What is the electric potential energy of this charge at the origin?
A) -3.2 × 10-4 J B) 3.2 × 10-4 J C) -40 ?J D) 40 ?J E) 8.0 ?J
Two converging lenses, the first with focal length 10.0 cm and the second with focal length 20.0 cm, are separated by 40.0 cm. An object, 3.00 cm in height, is placed 30.0 cm in front of the first lens. Which of the following characteristics does the final image have?
A. real and upright B. real and inverted C. virtual and upright D. virtual and inverted E. none of these choices are correct