Entropy: A 700-g quantity of an ideal gas undergoes a reversible isothermal compression at a temperature of 330 K. The compression reduces the volume of the gas from 0.40 m3 too 0.15 m3. The molecular mass of the gas is 38.0 g/mol. What is the entropy change for the gas during this compression? (R = 8.31 J/mol ? K)
A. -150 J/K
B. -57 J/K
C. 150 J/K
D. 57 J/K
E. 0 J/K
Answer: A
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Fill in the blank(s) with the appropriate word(s).
Size of the Nucleus: Calculate the estimated density of the nucleus of 
Sr? (mneutron ? mproton = 1.67 × 10-27 kg)
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A) a galaxy that is 1 billion years old. B) a galaxy that is 1 billion light years old. C) a galaxy that is 13 billion years old. D) a galaxy as it was 1 billion years ago.
Sunspots are known to be magnetic phenomena because
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