The half-life of a radioactive isotope is
A) half the time that it takes for a radioactive isotope to eat a large pizza.
B) half the time required for the decay of a large sample of nuclei of that isotope.
C) half the time required for a nucleus of that isotope to decay.
D) the time required for the decay of half of a large sample of nuclei of that isotope.
E) the time required for a nucleus of that isotope to partially decay.
D
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___________ is an irregular galaxy that is passing close to the Milky Way and is expected to merge with the Milky Way in the future
a. The Andromeda galaxy b. The Small Magellanic Cloud c. M87 d. The Virgo cluster e. The Whirlpool galaxy
Melting snow tends to
A) warm the surrounding air. B) cool the surrounding air. C) neither of these
Light not only has wavelike properties, but also has particle-like properties. What are these "particles" of light called?
a. quarks c. photons b. wavicles d. etherons
Determine the minimum area of a flat ice floe 1.0 meter thick if it is to support a 2 000-kg car above seawater. (rice = 920 kg/m3, rsea = 1 020 kg/m3.)
a. 20 m2 b. 40 m2 c. 60 m2 d. 80 m2 e. 100 m2