The reason that we can calculate the change in entropy of a system is that
a. entropy always decreases.
b. entropy always increases.
c. the entropy of the universe always remains constant.
d. it depends only on the properties of the initial and final equilibrium states.
e. systems always follow reversible paths.
d
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What do we mean when we say the universe becomes transparent at 300,000 years after the Big Bang?
A: we can only see from one end of the universe to another if we existed before that time B: electromagnetic radiation (light) can travel freely through the universe so we can see to large distances C: Helium nuclei formed then and since they are transparent it was possible to see to larger distances D: protons and neutrons formed then and since they are transparent it was possible to see to larger distances E: the universe ends at that time
How does the amount of sand in a soil influence its water holding ability?
What will be an ideal response?
Juno discovered that the polar regions of Jupiter are far more chaotic than the belts and zones.
Answer the following statement true (T) or false (F)
A significant step in "unifying" the forces of nature was the discovery that two of the so-called fundamental forces were two parts of a single force. The two forces that were so unified were
A) the electromagnetic force and the weak force. B) the weak force and the strong nuclear force. C) the electromagnetic force and the strong nuclear force. D) the electromagnetic force and the gravity force.