In a partially stabilized zirconia-calcia chemical sensor, the electrical conductivity is due primarily to:
(a) Electron flow in the conduction band
(b) Hole diffusion in the valence band
(c) Oxygen ion diffusion
(d) Zirconium ion diffusion
(c) Oxygen ion diffusion
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The neutron is made up of which one of the following quark combinations (up, down, strange, charm, top, bottom)?
A) uud B) ddu C) udd D) ttb E) bst
Which of the following expresses a principle, which was initially stated by Galileo and was later incorporated into Newton's laws of motion?
a. An object's acceleration is inversely proportional to its mass. b. For every action there is an equal but opposite reaction. c. The natural condition for a moving object is to remain in motion. d. The natural condition for a moving object is to come to rest.
Three identical 3.0-µC charges are placed at the vertices of an equilateral triangle that measures 30 cm on a side. What is the magnitude of the electrostatic force exerted on any one of the charges? (k = 1/4??0 = 9.0 × 109 N ? m2/C2 )
A) 1.6 N B) 1.8 N C) 2.0 N D) 2.2 N E) 2.4 N
We are at the center of the Universe, and hence, everything is expanding away from us.
Answer the following statement true (T) or false (F)