Internal energy is a state function
Indicate whether the statement is true or false
TRUE
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Describe spiral arms
What will be an ideal response?
The entropy of a certain macropartition of a combined system is 102kB. The entropy of another macropartition is 204kB. How much more likely is the system to be in the second macropartition than the first?
A. 2 times
B. e2 = 7.4 times
C. 102 = 100 times
D. e102 = 2 × 1044 times
E. 
? e0; so the two macropartitions have basically the same probability
What is the approximate composition of the interstellar medium (by mass) in our region of the Milky Way?
A) 60% hydrogen, 40% helium B) 70% hydrogen, 28% helium, 2% heavier elements C) 70% hydrogen, 20% helium, 10% heavier elements D) 50% hydrogen, 48% helium, 2% heavier elements
Rayleigh scattering would have 400. nm light be scattered how many times as much as 800. nm light?
A) 32 B) 4 C) 8 D) 2 E) 16