Physicist: A kilogram of antimatter mixed with a kilogram of matter would, through their mutual annihilation, release half as much energy as all the gasoline burned in the United States in 2005. But this process will never provide a practical means of generating energy: no known natural sources of antimatter are available, and the most efficient antimatter generator now in existence would have to run for 100 trillion years to make a kilogram of antimatter.
Which of the following is an assumption required by the physicists argument?
A. No other fuel could release as much energy per kilogram as antimatter when it is mixed with matter.
B. Present physics indicates that antimatter is unlikely to exist anywhere in large enough quantities to be usable as fuel.
C. No antimatter has yet been found in large enough quantities to be perceived by the naked eye (without magnifying instruments).
D. We will never, in the future, build an antimatter generator efficient enough to produce, within a practical amount of time, a sufficient amount to be practical as a fuel.
E. Making a kilogram of antimatter would take less than half as much energy as was released by all the gasoline burned in the United States in 2005.
Which of the following is an assumption required by the physicists argument?
A. No other fuel could release as much energy per kilogram as antimatter when it is mixed with matter.
B. Present physics indicates that antimatter is unlikely to exist anywhere in large enough quantities to be usable as fuel.
C. No antimatter has yet been found in large enough quantities to be perceived by the naked eye (without magnifying instruments).
D. We will never, in the future, build an antimatter generator efficient enough to produce, within a practical amount of time, a sufficient amount to be practical as a fuel.
E. Making a kilogram of antimatter would take less than half as much energy as was released by all the gasoline burned in the United States in 2005.
