Sulfur has an atomic number of 16. What would be the valence number of this element?
A. One
B. Two
C. Three
D. Four
E. Six
Ans: E. Six
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A conductor differs from an insulator in that a conductor has more
A) electrons than protons. B) protons than electrons. C) energy than an insulator. D) faster moving molecules. E) none of the above
The carbon in a certain ancient ax-handle is only 1/8--one-eighth--as radioactive as the carbon in living wood. The half-life of 14C is 6000 years. From these facts we can conclude that
A) the ax-handle was made from an unusual type of wood that was less radioactive than normal wood. B) the ax-handle is about 18,000 years old. C) the natural carbon-radioactivity at the time the ax-handle was made was only one-eighth of what it is today. D) the ax-handle is about 12,000 years old. E) the ax-handle is about 48,000 years old.
An incompressible fluid is flowing through a horizontal pipe with a constriction. The velocity of the fluid in the wide section of the pipe is 6.00 m/s and the velocity of the fluid in the narrow section of pipe is 8.00 m/s. The pressure of the fluid in the wide section is 250 kPa. What is the pressure in the narrow section of the pipe? (density of the fluid is 1000 
A. 183 kPa B. 236 kPa C. 268 kPa D. 285 kPa E. 298 kPa
Before light can undergo total internal reflection when incident on material 2 from material 1, what must be true of the indices of refraction?
a. n1 = n2 b. n1 < n2 c. n1 > n2 d. Either n1 or n2 must be equal to 1.