Which two satellites of Jupiter are considered "fraternal twins"?
A) Io and Europa
B) Io and Callisto
C) Europa and Ganymede
D) Ganymede and Callisto
E) Europa and Callisto
D
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An up quark (u) has a charge of +2/3 and a down quark (d) has a charge of -1/3. Which of the following describes a neutron?
A) uuu B) uud C) udd D) ddd
The nucleus that has the greatest mass per nucleon is
A) hydrogen. B) iron. C) lead. D) uranium. E) plutonium.
Which of the following represents the smallest range of temperatures?
A) 50-100° Kelvin B) 50-100° Celsius C) 50-100° Fahrenheit D) They all represent the same range in temperature.
If ?o is less than one, then:
A) the universe is closed, and must recycle. B) the universe will expand forever. C) no matter could have existed. D) only dark energy exists in the universe. E) there is more matter than energy in the universe.