{"id":57549,"date":"2025-08-26T21:17:32","date_gmt":"2025-08-26T15:47:32","guid":{"rendered":"https:\/\/e-gmat.com\/blogs\/?p=57549"},"modified":"2025-09-05T00:30:31","modified_gmt":"2025-09-04T19:00:31","slug":"physicist-a-kilogram-of-antimatter-mixed-with-a-kilogram-of-matter","status":"publish","type":"post","link":"https:\/\/e-gmat.com\/blogs\/physicist-a-kilogram-of-antimatter-mixed-with-a-kilogram-of-matter\/","title":{"rendered":"Physicist: A kilogram of antimatter mixed with a kilogram of matter would, through&#8230;&#8230;"},"content":{"rendered":"<span class=\"rt-reading-time\" style=\"display: block;\"><span class=\"rt-label rt-prefix\">A <\/span> <span class=\"rt-time\">4<\/span> <span class=\"rt-label rt-postfix\">min read <\/span><\/span>\n<p>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.<\/p>\n\n\n\n<p>Which of the following is an assumption required by the physicist&#8217;s argument?<\/p>\n\n\n\n<ul><li>A. No other fuel could release as much energy per kilogram as antimatter when it is mixed with matter.<\/li><li>B. Present physics indicates that antimatter is unlikely to exist anywhere in large enough quantities to be usable as fuel.<\/li><li>C. No antimatter has yet been found in large enough quantities to be perceived by the naked eye (without magnifying instruments).<\/li><li>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.<\/li><li>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.<\/li><\/ul>\n\n\n\n<h2 id=\"h-solution\">Solution<\/h2>\n\n\n\n<h3 id=\"h-passage-analysis\">Passage Analysis:<\/h3>\n\n\n\n<figure class=\"wp-block-table\"><table><tbody><tr><td><strong>Text from Passage<\/strong><\/td><td><strong>Analysis<\/strong><\/td><\/tr><tr><td><em>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.<\/em><\/td><td><strong>What it says:<\/strong>&nbsp;Antimatter-matter reactions create enormous amounts of energy &#8211; we&#8217;re talking about crazy amounts here<br><strong>What it does:<\/strong>&nbsp;Sets up how incredibly powerful this energy source could theoretically be<br><strong>What it is:<\/strong>&nbsp;Physicist&#8217;s factual claim about antimatter&#8217;s energy potential<br><strong>Visualization:<\/strong>&nbsp;2 kg total (1 kg antimatter + 1 kg matter) \u2192 Energy equal to 50% of ALL US gasoline used in 2005 (imagine half of every gas station, car tank, etc. in America for a whole year)<\/td><\/tr><tr><td><em>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.<\/em><\/td><td><strong>What it says:<\/strong>&nbsp;Despite the huge energy potential, antimatter can&#8217;t be a practical energy source because we can&#8217;t get enough of it<br><strong>What it does:<\/strong>&nbsp;Completely flips from the promising setup to explain why it won&#8217;t work in reality<br><strong>What it is:<\/strong>&nbsp;Physicist&#8217;s main conclusion with supporting evidence<br><strong>Visualization:<\/strong>&nbsp;Current best generator: 100,000,000,000,000 years \u2192 1 kg antimatter (that&#8217;s longer than the universe has existed by thousands of times)<\/td><\/tr><\/tbody><\/table><\/figure>\n\n\n\n<h3 id=\"h-argument-flow\">Argument Flow:<\/h3>\n\n\n\n<p>&#8220;The physicist starts by acknowledging antimatter&#8217;s incredible energy potential, then immediately argues against its practicality by showing the massive obstacles to obtaining antimatter&#8221;<\/p>\n\n\n\n<h3 id=\"h-main-conclusion\">Main Conclusion:<\/h3>\n\n\n\n<p>&#8220;Antimatter will never provide a practical way to generate energy&#8221;<\/p>\n\n\n\n<h3 id=\"h-logical-structure\">Logical Structure:<\/h3>\n\n\n\n<p>&#8220;The argument uses a &#8216;yes, but&#8217; structure &#8211; admits antimatter has amazing energy potential BUT shows this doesn&#8217;t matter because we can&#8217;t get antimatter in any reasonable way (no natural sources + current production is impossibly slow)&#8221;<\/p>\n\n\n\n<h3 id=\"h-prethinking\">Prethinking:<\/h3>\n\n\n\n<h4 id=\"h-question-type\">Question type:<\/h4>\n\n\n\n<p>Assumption &#8211; We need to find what the physicist must believe to be true for their argument to work. We&#8217;re looking for unstated beliefs that, if false, would make the conclusion fall apart.<\/p>\n\n\n\n<h4 id=\"h-precision-of-claims\">Precision of Claims<\/h4>\n\n\n\n<p>The physicist makes precise quantitative claims (100 trillion years, 1 kilogram) and an absolute conclusion (&#8216;will never provide a practical means&#8217;). The word &#8216;never&#8217; is key &#8211; this means not just impractical now, but impractical forever.<\/p>\n\n\n\n<h4 id=\"h-strategy\">Strategy<\/h4>\n\n\n\n<p>Since this is an assumption question, we need to identify ways the conclusion could be falsified while respecting the stated facts. The physicist concludes antimatter will &#8216;never&#8217; be practical based on current technology taking 100 trillion years. We need to find what unstated beliefs make this reasoning work &#8211; what must be true about future technology, alternative methods, or practical timeframes for this &#8216;never&#8217; conclusion to hold?<\/p>\n\n\n\n<h3>Answer Choices Explained<\/h3>\n\n\n\n<p>A. No other fuel could release as much energy per kilogram as antimatter when it is mixed with matter.<\/p>\n\n\n\n<p><strong>&#8216;No other fuel could release as much energy per kilogram as antimatter when it is mixed with matter.&#8217;<\/strong>&nbsp;This isn&#8217;t required for the argument. The physicist&#8217;s point is that antimatter won&#8217;t be practical due to acquisition problems, not because other fuels might be more energy-dense. Even if other fuels released more energy per kilogram, antimatter could still be impractical due to the production issues the physicist describes.<\/p>\n\n\n\n<p>B. Present physics indicates that antimatter is unlikely to exist anywhere in large enough quantities to be usable as fuel.<\/p>\n\n\n\n<p><strong>&#8216;Present physics indicates that antimatter is unlikely to exist anywhere in large enough quantities to be usable as fuel.&#8217;<\/strong>&nbsp;This is too narrow &#8211; the physicist already states &#8216;no known natural sources of antimatter are available,&#8217; which covers this point. We don&#8217;t need this assumption since the physicist has already addressed natural sources explicitly.<\/p>\n\n\n\n<p>C. No antimatter has yet been found in large enough quantities to be perceived by the naked eye (without magnifying instruments).<\/p>\n\n\n\n<p><strong>&#8216;No antimatter has yet been found in large enough quantities to be perceived by the naked eye.&#8217;<\/strong>&nbsp;This is about detection rather than practical energy generation. Whether we can see antimatter with naked eyes doesn&#8217;t affect the argument about its practicality as fuel &#8211; the issue is getting enough antimatter, not detecting what we have.<\/p>\n\n\n\n<p>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.<\/p>\n\n\n\n<p><strong>&#8216;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.&#8217;<\/strong>&nbsp;This is exactly what the physicist must assume. The conclusion says antimatter will &#8216;never&#8217; be practical, but the evidence only shows current technology is inadequate (100 trillion years). For this &#8216;never&#8217; conclusion to work, the physicist must assume future technology won&#8217;t solve the efficiency problem. If future generators could produce antimatter quickly, the whole argument collapses.<\/p>\n\n\n\n<p>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.<\/p>\n\n\n\n<p><strong>&#8216;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.&#8217;<\/strong>&nbsp;This would actually argue FOR antimatter&#8217;s practicality, not against it. If production required less energy than the antimatter would release, that would be energy-positive. The physicist&#8217;s argument doesn&#8217;t depend on the energy cost of production &#8211; it focuses on time constraints.<\/p>\n","protected":false},"excerpt":{"rendered":"<p>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 [&hellip;]<\/p>\n","protected":false},"author":102457,"featured_media":0,"comment_status":"closed","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"_et_pb_use_builder":"off","_et_pb_old_content":"","_et_gb_content_width":"","ub_ctt_via":""},"categories":[21,44],"tags":[],"featured_image_src":null,"author_info":{"display_name":"Kashish Garg","author_link":"https:\/\/e-gmat.com\/blogs\/author\/kashish\/"},"yoast_head":"<!-- This site is optimized with the Yoast SEO Premium plugin v17.1.1 (Yoast SEO v17.1) - https:\/\/yoast.com\/wordpress\/plugins\/seo\/ -->\n<title>Physicist: A kilogram of antimatter mixed with a kilogram of matter would, through......<\/title>\n<meta name=\"description\" content=\"Physicist: A kilogram of antimatter mixed with a kilogram of matter would, through their mutual annihilation, release 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