1 00:00:05,420 --> 00:00:06,870 YEN-JIE LEE: So during the class, 2 00:00:06,870 --> 00:00:11,660 I usually do a little vote on the physical situation 3 00:00:11,660 --> 00:00:14,450 we are interested in to predict what will be 4 00:00:14,450 --> 00:00:17,780 the outcome of the calculation. 5 00:00:17,780 --> 00:00:21,920 I think that is actually a very, very interesting thing to do. 6 00:00:21,920 --> 00:00:25,490 First of all, that will attract the attention of the students 7 00:00:25,490 --> 00:00:27,650 that we are going to do a prediction 8 00:00:27,650 --> 00:00:29,740 of a physical situation. 9 00:00:29,740 --> 00:00:30,350 OK? 10 00:00:30,350 --> 00:00:33,080 So that's actually the first purpose, 11 00:00:33,080 --> 00:00:38,420 to encourage participation of the students into class. 12 00:00:38,420 --> 00:00:43,130 And then secondly, I can know if the majority of the students 13 00:00:43,130 --> 00:00:48,020 already know the outcome or not by looking at the vote result. 14 00:00:48,020 --> 00:00:51,680 So if I have-- 15 00:00:51,680 --> 00:00:57,750 if I have my polarizer orienting in this direction, 16 00:00:57,750 --> 00:01:02,170 can you predict what will happen to the readout on the scope? 17 00:01:02,170 --> 00:01:04,220 Will I see signal or not? 18 00:01:04,220 --> 00:01:07,930 How many of you actually think we will see signal 19 00:01:07,930 --> 00:01:10,060 if I arrange that? 20 00:01:10,060 --> 00:01:11,560 The electromagnetic wave is actually 21 00:01:11,560 --> 00:01:14,730 pointing-- polarized in the up and down direction. 22 00:01:14,730 --> 00:01:18,460 OK, one, two-- 23 00:01:18,460 --> 00:01:21,430 OK, only four people think so. 24 00:01:21,430 --> 00:01:25,390 How many of you think nothing will change? 25 00:01:25,390 --> 00:01:29,090 I'm sorry, nothing will be observed by the scope. 26 00:01:29,090 --> 00:01:31,600 OK, most of you actually think so. 27 00:01:31,600 --> 00:01:35,660 So let's actually really do the experiment. 28 00:01:35,660 --> 00:01:42,300 I choose to use an analog method instead of clicker or support 29 00:01:42,300 --> 00:01:45,470 with other technical tools. 30 00:01:45,470 --> 00:01:48,170 And that is because I would like this process 31 00:01:48,170 --> 00:01:53,600 to be as smooth as I could achieve. 32 00:01:53,600 --> 00:01:56,630 So doing it by raising your hand, first of all, 33 00:01:56,630 --> 00:02:00,980 they have to do a lot more by raising your hand 34 00:02:00,980 --> 00:02:02,550 instead of clicking a button. 35 00:02:02,550 --> 00:02:04,940 So that actually makes a difference for them 36 00:02:04,940 --> 00:02:07,300 to focus on my question. 37 00:02:07,300 --> 00:02:07,910 OK. 38 00:02:07,910 --> 00:02:13,310 So secondly, I don't want to do a automatic counting 39 00:02:13,310 --> 00:02:15,740 because usually, they provide a graph, 40 00:02:15,740 --> 00:02:19,880 and I have to switch back and forth between graph 41 00:02:19,880 --> 00:02:23,490 and my lectures or my other lecture slides. 42 00:02:23,490 --> 00:02:25,640 And that usually takes some time. 43 00:02:25,640 --> 00:02:29,780 And also, that introduces interruptions 44 00:02:29,780 --> 00:02:31,780 during my lecture.