第7章 元素那些事 Elemental Matters · 第7讲S1

1. 老师，讲稿里说贝克勒尔把铀盐放在包好的摄影底片上，结果底片“burned an impression”。这里的 impression 是抽象的“印象”吗？为什么底片上会出现这种像被曝光一样的印记？
2. 玛丽·居里发现某些矿石在持续释放巨大能量（extraordinary amounts of energy），但体积却没变小（without diminishing in size）。这听起来好违反直觉，为什么能量跑出来了，石头却不会像木柴燃烧那样消耗掉呢？
3. 为什么老师觉得贝克勒尔发现这么重要的放射性现象，却把它交给一个刚移民来的研究生玛丽·居里去研究，是一件“奇怪”（strange）的事？这反映了当时学术界什么样的情况？
4. 讲稿里提到矿石是在“converting mass into energy”（质量转换为能量），而且效率极高。这和咱们常识里“能量守恒”或者“物质不灭”的感觉好像有点冲突，爱因斯坦后来是怎么解释这个现象的？
5. 这段讲稿把1896年铀盐的发现作为“原子时代的开端”（beginning of the Atomic Age）。除了这个偶然发现，还有哪些关键步骤（比如居里夫妇的工作）真正推动了从化学到原子物理学的转变？

1. The transcript mentions that when Becquerel placed the uranium salts on the wrapped photographic plate, it 'burned an impression.' Is 'impression' used here in the abstract sense of 'memory/impression,' or does it mean a physical mark? Why did the plate get exposed like that?
2. Madam Curie found that certain rocks emitted 'extraordinary amounts of energy' constantly, yet they didn't 'diminish in size.' This sounds counter-intuitive. Why didn't the rocks get smaller or consume themselves like burning wood, even though they were releasing so much energy?
3. Why does the teacher say it was 'strange' for Becquerel to hand over such a significant discovery to a graduate student, specifically a recent emigre like Marie Curie? What does this reflect about the academic context at that time?
4. The lecture mentions that the rocks were 'converting mass into energy' in an exceedingly efficient way. How does this relate to the concept of mass-energy equivalence, and how did Einstein's explanation in the following decade clarify why the mass loss was so hard to detect?
5. The title calls 1896 the 'beginning of the Atomic Age.' Beyond this accidental discovery of radioactivity, what other key steps (like the Curies' work) were crucial in transitioning science from chemistry to atomic physics?

1 00:00:03,960 --> 00:00:06,380 Organic Well, 2 00:00:11,590 --> 00:00:14,530 today we are going to talk about the beginning of the 3 00:00:14,530 --> 00:00:18,430 Atomic Age,就是原子时代的开端。 4 00:00:20,170 --> 00:00:24,030 The nineteenth century held one last great surprise 5 00:00:24,030 --> 00:00:24,910 for chemists. 6 00:00:25,170 --> 00:00:29,550 It began in 1896 when Henri Baguerau in Paris 7 00:00:29,550 --> 00:00:33,670 carelessly left a packet of uranium salts on a wrapped 8 00:00:33,670 --> 00:00:35,730 photographic plate in a drawer. 9 00:00:36,380 --> 00:00:37,520 Uranium salts 10 00:00:37,920 --> 00:00:44,160 油盐这个油就是上一课我们说到过的原子序号为 90 号 11 00:00:44,160 --> 00:00:49,700 的放射性物质而 salt 当然不是我们厨房里的盐我们厨 12 00:00:49,700 --> 00:00:55,380 房里的盐是氯化钠这个油盐是指油和钠的某种化合物 13 00:00:56,260 --> 00:01:01,540 有一天这位 Henry Bevere 无意之中把一小袋的油盐放 14 00:01:01,540 --> 00:01:06,680 在抽屉里正好就放在 a wrapped photographic plate 放 15 00:01:06,680 --> 00:01:12,730 在一张包好的摄影底片上面这个摄影底片现在的小孩 16 00:01:12,730 --> 00:01:17,720 子都不太有机会看到因为现在大家都用手机拍照不再 17 00:01:17,720 --> 00:01:23,140 用这种 photographic plate 只是在医院照 X 光的时候可 18 00:01:23,140 --> 00:01:28,620 以拿到一张这样的一个 plate 这种摄影底片有光线照 19 00:01:28,620 --> 00:01:33,580 射在上面的时候它就会成像所以平常保存它要包裹得 20 00:01:33,580 --> 00:01:39,680 很好不要让它见光那有一天这个油盐就被放到了这个 21 00:01:39,680 --> 00:01:44,420 摄影底片上面大家要注意到这个油盐是包好的 a 22 00:01:44,420 --> 00:01:49,060 packet 是包在一个 packet 里面这个摄影底片也是包好 23 00:01:49,060 --> 00:01:50,260 的 When 24 00:01:51,120 --> 00:01:55,800 he took the plate out some time later he was surprised to 25 00:01:55,800 --> 00:02:00,040 discover that the source had burned an impression in it 26 00:02:00,040 --> 00:02:05,040 Just as if the plate had been exposed to light 后 27 00:02:05,620 --> 00:02:10,740 来他把这张底片拿出来的时候就很惊讶地发现这一包 28 00:02:10,740 --> 00:02:16,880 的油盐在底片上烧出了一个印记 Impression 我们平时 29 00:02:16,880 --> 00:02:21,320 可能觉得 impression 是印象是表示抽象意义上的印象 30 00:02:21,320 --> 00:02:27,720 其实 impression 就是指印在什么东西上呈现出来的那 31 00:02:27,720 --> 00:02:33,240 个印象就叫 impression 它是有个很具体的意思的这就 32 00:02:33,240 --> 00:02:42,330 是那一包的油盐留下的 impression 这种情况就像是这 33 00:02:42,330 --> 00:02:46,600 个底片被曝光了那样被曝光了 34 00:02:52,880 --> 00:02:58,700 看来是这一包的油盐在 emitting rays of some 35 00:02:58,700 --> 00:03:04,600 sortemitting means giving out 再发出某种光线 rays 36 00:03:04,780 --> 00:03:10,760 光线 considering the importance of what he had found 37 00:03:10,760 --> 00:03:15,240 Bekkerow did a very strange thing he turned the matter 38 00:03:15,240 --> 00:03:18,060 over to a graduate student for investigation 39 00:03:18,800 --> 00:03:25,260 Bekkerow 做了一件让人感到奇怪的事他把这个事情交 40 00:03:25,260 --> 00:03:30,220 给了一位研究生 graduate student 交给一位研究生去 41 00:03:30,220 --> 00:03:35,600 研究去调查为什么说这是一件有点奇怪的事呢因为 42 00:03:38,440 --> 00:03:43,440 因为他发现了这个东西具有很重大的意义这么重要的 43 00:03:43,440 --> 00:03:48,520 事情交给一个研究生去做那这不是有点奇怪吗幸好 44 00:03:48,520 --> 00:03:55,920 这 45 00:03:56,300 --> 00:03:58,540 位研究生不是一般的一位研究生 46 00:03:58,560 --> 00:04:04,120 她是最近刚从波兰移民过来的玛丽居里 When 47 00:04:04,350 --> 00:04:07,650 you say this word emigre I'm sure you will think of 48 00:04:07,650 --> 00:04:11,790 emigrant 移民 Especially for political reasons 这个 49 00:04:11,790 --> 00:04:17,530 emigre 尤其是指出于政治原因而离开自己原来生活的 50 00:04:17,530 --> 00:04:22,530 地方到另外一个地方生活的这样的移民那这位 Mary 51 00:04:22,530 --> 00:04:28,890 Curie 就是玛丽居里居里夫人她的祖籍是波兰这是波 52 00:04:28,890 --> 00:04:30,210 兰现在的位置 53 00:04:30,940 --> 00:04:37,140 但是在当时波兰已经被三个国家瓜分了被俄国奥地利 54 00:04:37,140 --> 00:04:41,520 和普鲁士给瓜分了所以这个时候波兰这个国家可以说 55 00:04:41,520 --> 00:04:44,640 是不存在的 Working with her new husband, 56 00:04:44,880 --> 00:04:48,440 Pierre Curie found that certain kinds of rocks poured 57 00:04:48,440 --> 00:04:52,000 out constant and extraordinary amounts of energy yet 58 00:04:52,000 --> 00:04:55,140 without diminishing in size or changing in any 59 00:04:55,140 --> 00:04:57,480 detectable way Pierre, 60 00:04:57,580 --> 00:04:58,960 Madam Curie's husband. 61 00:04:59,340 --> 00:05:01,480 His name was Pierre Curie. 62 00:05:01,600 --> 00:05:03,360 So it's quite confusing here, 63 00:05:03,520 --> 00:05:07,860 because both are named Curie.两个人的姓都是 Julie, 64 00:05:07,940 --> 00:05:12,340 but we ought to know that Curie here means Madam Curie 65 00:05:12,340 --> 00:05:15,240 herself.Mad am Curie,这里说的 Julie, 66 00:05:15,240 --> 00:05:19,700 指的是 Julie 夫人,也就是这里说的这位她。 67 00:05:20,240 --> 00:05:21,260 New husband, 68 00:05:21,520 --> 00:05:25,000 because they had been married for just one year by that 69 00:05:25,000 --> 00:05:25,340 time. 70 00:05:40,300 --> 00:05:46,120 我们知道倒咖啡倒水都是用这个词那其实我们可以把 71 00:05:46,120 --> 00:05:51,660 它替换成 give out 不过假如换成 give out 那这里就少掉 72 00:05:51,660 --> 00:05:56,620 了一种意思因为用 pull out 好像爆出来可以让人感觉 73 00:05:56,620 --> 00:06:02,160 到它那个量是巨大的 constant means happening all the 74 00:06:02,160 --> 00:06:06,680 time or regularly 这里是指持续的 and 75 00:06:06,810 --> 00:06:12,350 extraordinary amount of energy 基里夫人发现某些矿 76 00:06:12,350 --> 00:06:18,950 石持续不断地上发出大量的能量会发出大量的能量 77 00:06:18,950 --> 00:06:21,310 yet without diminishing in size 78 00:06:25,550 --> 00:06:29,970 之前学过这个 detect 表示侦测测量 79 00:06:38,030 --> 00:06:45,430 就这些矿石发出巨大的能量但是却无法观察到它们自 80 00:06:45,430 --> 00:06:49,490 己的体积有什么变化没有看到变小 81 00:07:05,540 --> 00:07:12,740 照理说一个事物发出这种 energy 它自己应该是会消耗 82 00:07:12,740 --> 00:07:18,310 掉所以应该体积要变小比如说木柴燃烧散发光和热然 83 00:07:18,310 --> 00:07:23,120 后这个木材慢慢的自己就没有了变成灰烬可是他现在 84 00:07:23,120 --> 00:07:29,280 观察到的现象就是这些 rock 能够 pull out constant and 85 00:07:29,280 --> 00:07:34,000 extraordinary amounts of energy 而自身却没有变小 86 00:07:34,000 --> 00:07:38,630 with out diminishing in size or changing 至少是他们可 87 00:07:38,630 --> 00:07:43,220 以测量的范围来看是没有变小所以即便有变小他们也 88 00:07:43,220 --> 00:07:45,980 无法测量的很少很少 What 89 00:07:46,200 --> 00:07:50,200 she and her husband couldn't know 她和她的丈夫当时不 90 00:07:50,200 --> 00:07:53,040 可能了解到的是 What's that? 91 00:07:53,320 --> 00:07:57,260 我们先接到这 The rocks were converting mass into 92 00:07:57,260 --> 00:07:59,980 energy 这些石 ……（后略，完整文稿见视频页字幕）