The half-life of 20F is 11 s. What fraction of a sample of 20F will remain after 99 s have elapsed?
a. 1/10
b. 1/9
c. 1/400
d. 1/512
e. None of these
d
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According to the Solar Nebula theory, planets:
A) should be randomly oriented to their star's equator. B) will revolve opposite the star's rotation. C) should be a common result of star formation. D) should be extremely rare. E) should orbit perpendicular to their star's equator.
Processes in which one type of quark is converted into another type of quark involve which force?
a. electromagnetic c. weak force b. strong force d. gravitational
Can an element decay "backward" in the periodic table, to a lower atomic number?
A) No, in fact elements cannot alter their atomic number by radioactive decay. B) No, but an element can decay to a higher atomic number. C) Yes, by beta decay. D) Yes, by alpha decay. E) Yes, radioactive decay always causes elements to decay to a lower atomic number.
A primary application of _________is as a cladding for nuclear fuel rods.
Fill in the blank(s) with the appropriate word(s).