An antimatter reactor. When a particle meets its antiparticle (more about this in Chapter 30), they annihilate each other and their mass is converted to light energy. The United States uses approximately 1.0 ×1020 J of energy per year, (a) If all this energy came from a futuristic antimatter reactor, how much mass would be consumed yearly? (b) If this antimatter fuel had the density of Fe (7.86 g/cm3) and were stacked in bricks to form a cubical pile, how high would it be? (Before you get your hopes up, antimatter reactors are a long way in the future—if they ever will be feasible.)
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