For all irreversible processes involving a system and its environment:

A. the entropy of the system does not change
B. the entropy of the system increases
C. the total entropy of the system and its environment does not change
D. the total entropy of the system and its environment increases
E. none of the above


Ans: D. the total entropy of the system and its environment increases

Physics & Space Science

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Coulomb's Law: Three point charges are located on the x-axis at the following positions: Q1 = +2.00 ?C is at x = 1.00 m, Q2 = +3.00 ?C is at x = 0.00, and Q3 = -5.00 ?C is at x = -1.00 m. What is the magnitude of the electric force on Q2? (k = 1/4??0 = 8.99 × 109 N ? m2/C2)

A. 0.0540 N B. 0.135 N C. 0.158 N D. 0.0810 N E. 0.189 N

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Physics & Space Science

Semiconductors: In a good conductor, the highest energy band containing electrons is

A. only partially filled. B. completely filled. C. completely empty.

Physics & Space Science