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This week we'll be talking about probably one of the most important aspects of photography, which is light. As in photo-graphy [spoken phonetically], writing or drawing with light. It's a very content-rich conversation, we're going to have, and could really, easily, take up a full six-week course. But for our purposes here, we're going to give you something of an overview, showing you various forms and characteristics of some light sources. We can't address every conceivable possibility. But what we can do is tweak your curiosity, I hope, so that you pay attention, very close attention, to what you're seeing as you change your own light sources, looking at the shadows for example. How do they and they and the highlights change as you move your light source? And observe exactly what's going on when you make even some very minimal changes. Let's start with a very simple piece of equipment, a lightbox. It's really easy to use when you...

PROFESSOR: This will be qualitative insights on the wave function. It's qualitative, and it's partially quantitative of course, insights into, let's say, real energy eigenstates. So whenever you have a problem and a potential, we have what is called the total energy, the kinetic energy, and the potential energy. So you have the energy, which is total, equal kinetic energy plus the potential energy. Now, the potential energy, as you've seen, sometimes depends on position. We did piecewise continuous end potentials, but they could be more complicated and do funny things. So this is a function of x. And classically speaking, we speak of the energy. You see in quantum mechanics, the energy is an observable and is the result of a measurement with a permission operator. Sometimes there could be uncertainty, sometimes not. But in classical physics, which this intuition will come from, you have a total energy. It is conserved. It's equal to potential energy an...

PROFESSOR: Everyone seems to be here. At least all the seats are filled up, so why don't we begin. One thing that I did finally, to be specific, I told you that we would have three quizzes and that they would be uniformly spaced one third, and 2/3 and 2.89 thirds of the way through the term. And I figured out where those dates would be. So since I have them, let me give you the date. So Quiz 1 is going to be on Thursday, October 6. Quiz 2 will be on Tuesday, November 8, and Quiz 3 will be on Thursday, December 8. And this, as advertised, is exactly one third of the way through the lectures. This is exactly 2/3 of the way through the lectures, and this is the next to the last meeting that we'll have. This is the week before the final week of the terms. so I deliberately kept it a little bit away from the usual end-of-term crunch. Being person who is sensitive to symmetry and order, I find it highly regrettable that we cannot have the quiz on October 8. Then you wou...

One announcement. There will be Quiz 9, the weekly quiz tomorrow based on the content of Homework 9 which is, I don't remember what it is, but you know what it is. I made it up, but I am already thinking about the next glorious event. Now I remember. There is chemical kinetics and glasses. That's right, chemical kinetics and amorphous solids. That's right. Last day we started talking about diffusion which is solid state mass transport by random atomic motion. And we were drawn to the paper that is up on the display which was published in 1855 by Adolf Fick which gave us the law that bears his name describing how matter diffuses through matter. Fick was a very talented individual, and I want to draw attention to something else. Remember, he was a physiologist. He actually did some work in medicine as well. In 1870, he described what survives to this day as the Fick Principle for determining cardiac output and basically equates the amount of uptake of oxygen by ...

This will be Professor Cohen's kind of last complete lecture, although, on the last day of classes the plan is we're going to take some of the time just to talk over what we've done and review things. And it will be really oriented towards general aspects of systems engineering. And, Aaron, I will turn it over to you. Thank you. Today, I'm going to lecture primarily on systems engineering but management as it relates to systems engineering. I have several checks and balances. And, of course, today I've got people from the Draper Laboratories and people from the predecessor to Draper Laboratories, MIT Instrumentation Laboratory are going to check me to see if I say the right thing. First of all, I would like to say to you as a class that I read your last submission reports and really thought they were outstanding. They show a great deal of interest, a great deal of understanding and a great deal of initiative. And so, I really compliment you. And I'...