So, we could also plot the number of electrons that are ejected as a relationship to the intensity, so that was yet another experiment they could do.
我们还可以画出出射,电子数和光强的关系,这是他们做的。
I want to cool a gas with a Joule-Thomson experiment, what temperature do I have to be at?
给气体降温时,需要到达什么温度?
What must this experiment have the potential to do, to be a valid scientific experiment?
实验必须有做什么的能力,才能被称为一个有效的科学实验呢?
In fact, we'll do the whole experiment ourselves minus the radioactivity in just a minute, so we'll be able to answer that question for you.
来算一下,事实上等会儿,我们自己会把,整个实验都做一遍。
I just want to do a very quick experiment, so everyone stay in their seat.
现在做一个小小的实验,所有人都坐在自己的位子上
For example, one of the experiments we do is measure the magnetic field of current coil, and after we do the experiment, we all have a passive visualization that shows the same experimental set-up, except we add to that.
比如,我们做的一个实验就是,测量电线圈的磁场,在我们做完实验之后,我们都感受到了一个直观化的过程,它展现了同样的实验过程,只是那是我们加的。
For all I could tell, people did equally well but this experiment has been done tens of thousands of times and you could do it yourself on a computer screen.
据我所听到的,两次都差不多,但这个实验做过几十万次,你们可以在电脑上做。
And they do a beautiful experiment.
他们做了个完美的实验。
Because of that you can do the following experiment, and it's a simple experiment, it's simple to understand, but the concept is very important so I encourage you to think about it and make sure you understand it.
我们可以做一个实验,这是一个非常简单容易理解的实验,但是这个实验验证的概念非常重要,我希望你们能够仔细思考,并且能够掌握
This is real, unlike the Joule coefficient which is very small so that most gases have tiny Joule coefficients. So if you do a Joule experiment, you hardly measure a temperature change. With real gases, here you do actually measure it. You can feel it with your finger on your bicycle tire.
系数那样小以至于,大多数气体的焦耳系数,都很小,所以如果你做焦耳实验,很难测量出温度的变化,对于真实气体,你可以测量它,你能通过手指按在,自行车轮胎上来感觉到它。
This is a terribly stressful experiment to do to people and, as I say now about a lot of studies that I describe in this class, it would not today be done.
这些在人身上进行的实验非常有压力,正如我说过,有很多,我在课堂上讲过的实验,在今天都是不能进行的。
So, let's do a thought experiment.
让我们做一个思维的实验。
Sam All right. So, we'll move this up to the front in just a minute, but I'm going to explain how this experiment works and we'll do the calculation first before the excitement breaks out.
好的,这是她的女儿,被背带背她在胸前,这是Patti,Christie博士,好的,我们等会,会把它移到前面,但我要先解释下。
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