How many and what types of quarks are there in the standard model?
A) 6: up, down, top, bottom, strange, charmed
B) 2: up, down
C) 4: up, down, top, bottom
D) 6: up, down, left, right, weird, enchanted
E) 4: up, down, left, right
A) 6: up, down, top, bottom, strange, charmed
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Organisms with the ability to be easily preserved as fossils began to flourish about
A) 4.6 billion years ago. B) 3.8 billion years ago. C) 543 million years ago. D) 65 million years ago.
How many valence electrons does bromine (Br, atomic no. = 35) have?
A) 1 B) 7 C) 21 D) 28 E) 35
During each cycle of operation a refrigerator absorbs 45 cal from the freezer compartment and expels 85 cal to the room. If one cycle occurs every 8.0 s, how many minutes will it take to freeze 500 g of water, initially at 0°C? (Lv = 80 cal/g)
a. 800 min c. 120 min b. 4400 min d. 150 min
Steven Weinberg, Abdus Salam, and Sheldon Glashow shared the 1979 Nobel Prize in physics for their development of a(n)
a. electroweak theory. b. GUT. c. quark theory. d. generalized theory of relativity. e. theory of strangeness.