Recent content by Weimin

Thank you, marcusl. I would like to hear other suggestions then will decide later.

Hi, I am going to be a TA for the course semiconductor physics. The course is for the 3rd year undergraduate students so it will start from the very beginning concepts of semiconductors. Can you suggest some books containing problems about this field, it would be great if the solutions...

Well, so how about digging an area right below the bird so that the the air flow would not act on the plane but get out through that area?

Hmm, for some reason, the attached did not show up. I do it again. I suppose that the up-north speed is constant since the Coriolis effect is small. So the force towards the East is also constant. The trajectory of the bullet can be treated as a thing being thrown horizontally with a small...

OK, I put the pen down and got the result. You have to suppose that Coriolis effect is small. It is because the angular velocity of the Earth is small, 1 turn a day. Maybe the below picture helps you.

In [w, v], w is the angular velocity of the Earth which is directed from South to North, along the rotation axis, using the right hand rule. You're confused with the direction of the rotation, that's why you ended up with the upward vector :-)

Thank you, Claude, for the comment. In fact, this is the first time I saw such statement. I even asked the one who works in photonic crystals and no explanation at all. Now I believe this is not a universal effect like, for e.g., a Newton law, otherwise people would know that.

I'm quite sorry for that. I'm reading to understand the Second Harmonic Generation. The article I read (in our language, not English. I do not know the reference either) quoted the statement somewhere. That's why I ask you for the reference for the phenomenon since I think it's a popular effect...

I posted this question in another category but no replies, probably this place is more appropriate. I read a paper and it states that "the reflection spectrum is blue-shifted due to oblique angles of incidence" without a reference. Can anyone show me the reference of this phenomenon...

I'm quite confuse with some concepts here. The selection rules are derived from the requirements that quantum numbers must be conserved. It's OK. Then I see they give rules for so-called electric dipole transitions. I just wonder why dipole comes in here. How do you classify these kinds of...

I was a bit confused about that expression but look at the picture, the observers says the electric field is roting anticlockwise, that means he is looking against the direction of the light. Otherwise the picture and its caption are contrast themselves. If it is the matter of convention like...

So which one is correct as I've seen different definitions of right and left circular polarizations from different books?

I'm following the link creator provided, here http://hyperphysics.phy-astr.gsu.edu/hbase/phyopt/polclas.html According to this picture in the link below, we are looking to the light that is coming toward us. The text says: If this wave were approaching an observer, it electric vector would...

So what about the angle of 90 degrees? :-)

Proton, look at eq. 451: kx(kxE)=const*E This implies that k and E are orthogonal. If they were not, the result of the LHS would be another vector that's not parallel with E. Draw the product of v=kxE, and then kxv, you will see that.Or, another way is using axbxc=b(ac)-c(ab) where ab is...