In a fission bomb explosion, how many neutrons [on the average] created during the fission of a 235U nucleus cause further fission in other uranium nuclei?
A) None
B) Less than one
C) More than one
D) One
E) Ten
C
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The entropy of a system remains constant during an adiabatic change even if the change is irreversible
Indicate whether the statement is true or false
The presence of a magnetic field is a good indication that
A) the Earth's interior is similar to Mercury's, as both have fields. B) a huge iron meteorite lies somewhere high up in the mantle, not in the core. C) the Earth has a liquid metal outer core, spinning rapidly as it rotates. D) the Earth's interior has had time to solidify, with a rigid bar magnet created. E) the Earth's interior must be completely molten to the center.
How much of Jupiter is made of material that is in a gaseous phase?
A) Jupiter is entirely made of gas, all the way down to its center. B) Jupiter is entirely gaseous except for its rock core. C) Only about the outer 10% of Jupiter's interior is gaseous. D) Jupiter does not contain any gaseous phase material; it is all liquid or liquid metallic.
Dactyl was photographed by the Galileo spacecraft. It is:
A) a moon of the asteroid Ida. B) a moon of Halley's Comet. C) one of the small moons of Jupiter, thought to be a captured asteroid. D) one of the larger asteroids found in the asteroid belt. E) an Earth-crossing asteroid.