Viewing profile — typothrowaway

That still does not make any sense. I'm sorry to be so direct, but I'm really worried laypeople here are going to think that this is correct.

At least wikipedia seems to partially agree (on the cow part), with citations I couldn't verify: https://en.wikipedia.org/wiki/Vaccinia#History https://en.wikipedia.org/wiki/Cowpox…

No, as far as I know, there is no limit to a photon's wavelength, so it will just keep on stretching.

Sort of, yes. It's hard to put reasons and interpretations behind all this, because in the end we just use formulas and numbers and check them in experiments. It's usually simpler …

> (I tried, but the wikipedia chapter is too complicated for me => trying to simplify here) I can imagine. That stuff on the wiki is not even in every physics bachelor. It's defini…

Yes, using its momentum and energy. Here you can read the relations between a photon's momentum and things like wavelength. Without any mass :) https://en.wikipedia.org/wiki/Photon…

1) A photon's momentum is related to its wavelength, not it's speed. They all have the same speed in a vacuum. 2) Sure. > So, a remix of the original question, haha: if we say that…

> For perfect reflection, no. That's not true, it wouldn't conserve energy. The kinetic energy of the object that's hit changes, so the light must lose or gain energy. I think for …

Very nice. I think there are some typos though, below "Here were some of them, along with their continued fractions." Two of the shorthand notations for the continued fractions and…