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We have 266, as some of you might know who saw me counting ping-pong balls the other day in office hours.
看到了这些发泡胶球事实上,可以当作单层金原子核,我们有266个乒乓球。
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So, 13 backscattered. TAs, if you can maybe pick up these ping-pong balls for me.
把这些球捡起来，我觉得如果，我摔倒一定很搞笑。
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And again, you don't teach an animal to play Ping-Pong by waiting for it to play Ping-Pong and then rewarding it.
同样，你并不能通过等待动物打乒乓球,然后给其奖励,来使动物学会打乒乓球。
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It's not going to be a backscatter event if your ping-pong ball hits the frame or these strings, or the top part.
打到原子核了就是背散射,如果打到框上。
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So, it'll be considered a backscatter event if your ping-pong ball hits one of the nuclei.
什么情况是背散射,如果你们的乒乓球。
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All right. So, we'll come around and get ping-pong balls to the rest of you.
还有什么问题吗？如果你们,还没有乒乓球的话请举手，还有问题吗？
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Those of you who have your ping-pong balls can now begin the experiment.
好，我们会到这边来把球给你们,已经拿到球的同学就可以开始试验了。
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But in our case, the probability of backscattering is going to be the number of balls that backscatter, and that's going to be divided by the total number of ping-pong balls.
用20除以132000，但现在背散射,的概率是被散射回来的小球，除以总的小球数,你们记得。
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And later on if you right before or right during you give the dog some food you--you ping a bell the bell will cause the saliva to come forth.
,在喂食前或者喂食过程中,你摇铃,铃声就会加速唾液的分泌。
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More recreational, Skinner was fond of teaching animals to play Ping-Pong.
更好玩的是，斯金纳喜欢教动物们打乒乓球。
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PROFESSOR: So, as you're getting your ping-pong balls -- do not throw them yet.
如果你觉得，你的准心很好的话，你们现在都拿到乒乓球。
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Raise your hand if you don't if you don't have a ping-pong ball yet.
这样就可以算,背散射的概率了。
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We have 266 ping-pong balls, and we need someone, hopefully you, to be some radioactive material that are going to be emitting these ping-pong balls. And when the time comes, in just a minute, I'll ask the TAs to come down and hand these out very quickly to you, so we can do this experiment.
你们有些人那天，看到我在办公室数乒乓球，我们需要几个人,希望是你,来作为放射材料，放射这些乒乓球,等会我会让助教,把这些球发给你们。
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