题干

裂变反应是目前核能利用中常用的反应,以原子核92235U为燃料的反应堆中,当92235U俘获一个慢中子后发生的裂变反应可以有多种方式,其中一种可表示为:92235U+01n﹣→54139Xe+3894Sr+301n.

已知92235U的原子质量为235.043 9u,01n的原子质量为1.008 7u,54139Xe的原子质量为138,917 8u,3894Sr的原子质量为93.915 4u,且1u的质量对应的能量为9.3×102MeV,此裂变反应释放出的能量是多少MeV?保留三位有效数字.

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答案(点此获取答案解析)

解:根据核反应方程92235U+01n﹣→54139Xe+3894Sr+301n.

那么质量亏损△m=(235.043 9+1.008 7﹣138.917 8﹣93.915 4﹣3×1.008 7)=0.1929U

根据爱因斯坦质能方程得:△E=△mc

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    When I spent the summer with my grandmother, she always set me down to the general store with a list. Behind the counter was a lady like no one I'd ever seen.

    “Excuse me,” I said. She looked up and said, “I'm Miss Bee.”

    “I need to get these.” I said, holding up my list. “So? Go get them. ” Miss Bee pointed to a sign. “There's no one here except you and me and I'm not your servant, so get yourself a basket from that pile.”

    I visited Miss Bee twice a week that summer. Sometimes she shortcharged me. Other times she overcharged. Going to the store was like going into battle. All summer long she found ways to trick me. No sooner had I learned how to pronounce “bicarbonate of soda” and memorized its location on the shelves than she made me hunt for it all over again. But by summer's end the shopping trip that had once taken me an hour was done in 15 minutes.

    “All right, little girl,” she said. “What did you learn this summer?” “That you're a meanie!” I replied. Miss Bee just laughed and said, “I know what you think of me. Well, I don't care! My job is to teach every child I meet life lessons. When you get older you'll be glad!” Glad I met Miss Bee? Ha! The idea was absurd…

    Until one day my daughter came to me with homework troubles. “It's too hard,” she said. “Could you finish my math problems for me?”

    “If I do it for you, how will you ever learn to do it yourself?” I said. Suddenly, I was back at that general store where I had learned the hard way to add up my bill by myself. Had I ever been overcharged since?