What nuclide has 14 protons and 16 neutrons?
A. 16S
B. 14O
C. 30Si
D. 30S
C. 30Si
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Each atom in a sample of lithium (Z=3, atomic mass 6.941 u) has one electron removed. If exactly 1.0 mC was collected in this way, what is the mass of the lithium sample?
A. 0.024 ?g B. 0.010 ?g C. 0.031 ?g D. 0.072 ?g
In our best current theory, the first quasars formed about:
A) 14.5 billion years ago. B) 13 billion years ago. C) 12 billion years ago. D) 11 billion years ago. E) 9 billion years ago.
In a graph of the history of U.S. energy use since 1950, why does the graph drop sharply after 1973?
A) The 1973 mideast oil embargo was followed by increased prices and a drop in consumption. B) The Texas oil fields produced far less oil beginning in 1973, causing a price increase and a drop in consumption. C) The Texas oil fields produced far less oil beginning in 1973, resulting in rationing and a switch to natural gas. D) The 1973 mideast oil embargo was followed by gasoline rationing and a switch to domestic natural gas. E) Analysts have not yet found a good explanation for this drop in U.S. energy use.
Galileo deduced many empirical laws of motion before Newton was even born.
Answer the following statement true (T) or false (F)