If an average molecule diffuses to a displacement of 4 cm in 5 s, how long would it take for such a molecule to diffuse to a displacement of 16 cm?
a. 10 s
c. 36 s
b. 20 s
d. 80 s
D
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A 50-cm3 block of wood is floating on water, and a 50-cm3 chunk of iron is totally submerged in the water. Which one has the greater buoyant force on it?
A) the wood B) the iron C) Both have the same buoyant force. D) It cannot be determined without knowing their densities.
What is the purpose of the European CHEOPS mission?
A) to precisely measure the properties of known extrasolar planets B) to discover new types of extrasolar planets unobservable with current instruments C) to search for signals from alien civilizations D) to search for new extrasolar planets throughout the entire sky
In the geometry shown, the angles of the triangle
A) add up to less than 180 degrees. B) add up to more than 180 degrees. C) add up to exactly 180 degrees. D) cannot be measured.
Can an element decay "forward" in the periodic table, to a higher atomic number?
A) No, in fact elements cannot alter their atomic number by radioactive decay. B) No, but an element can decay to a lower atomic number. C) Yes, by alpha decay. D) Yes, this can occur by means of both beta decay and alpha decay. E) Yes, by beta decay.