3:40 AM
1

My father was colorblind, and I always wondered if colors were a matter of physics or if different colors is just a human way of describing and differentiating our visual perception of the world? Fx. is the color blue by nature blue, or is it just what we see?

11 hours later…
2:30 PM
2

Here, In Shankar's (2nd edition, p-283) QM book, The translation operator is given by $$T(\epsilon) = I - \frac{i\epsilon}{\hbar}G \tag{11.2.13}$$ Similar In Sakurai (Revised edition 1994 p-45), he wrote about equation as following, “We now demonstrate that if we take the infinitesimal transl...

3:19 PM
2

I am working on a scientific project for my university and I am reading a german paper (Karas: "Platten unter seitlichem Stoß") which makes use of generalised coordinates. It's about an analytical solution of the impact of a ball on a plate. At some point, he defines the potential energy for t...