Okay, let's get started.

We'll start the exercise with multiple choice questions.

Please scan

the QR code and then we'll look at the questions from the third exercise sheet.

I have to wait until you have scanned the QR code.

It looks like that.

Yes, I have it like that.

Yes, good. Now we can release it.

Let's do 90 seconds for the first question.

It also fits the flats.

I think that's what you did in the last lecture.

Just do what you can see when you look at the solution.

There was definitely a lot of controversy.

Let's talk about the individual things.

Not many people were enthusiastic about the disc diameter. I can see that.

That's really a bit controversial.

That's why I brought 150 and 200 wafers.

What we see is

if you compare the two

I don't have tweezers with me.

What does it occur to us when you look at the two wafers?

The flats are the biggest, but we still have a notch.

Exactly.

You can already make a statement about the disc diameter.

At least we can say that everything that has no flat but only a notch is 200 mm or bigger.

That would be correct.

Surface orientation.

I have a sheet of paper to read out.

And the doting.

We can actually read both out of the flat.

Of course not with a notch

but with the flat we can say that the end is divided into a CP and end table.

We can see the crystal direction based on the orientation from a small to a large flat.

Or if there is only a large flat, the angle.

We can say that we can read out the surface orientation from the flat.

We can read out the doting from the flat.

Of course

the main break direction is connected to the crystal orientation.

We can also read out the number of the placable elements and the purity of the rosin.

Thank God nobody crossed that.

And the number of the placable elements.

Of course

you could say indirectly if you can determine the diameter

but actually not.

If we are honest, we can't read it out of the flat.

Is the doting wrong?

The doting is correct. But I can summarize it all.

You can say P or N type depending on the flat orientation.

Say what is the mouse there. P type, N type.

Depending on whether you have one flat down here or a small flat