quantum

Dot Physics

Category archives for quantum

Why are sparks blue?

I am not sure if First Excited State posted this as a blog entry, but it was mentioned on twitter. Question: why are sparks blue? My first gut response was that this is the blackbody color. Wrong for several reasons. The short answer is that sparks are blue because of the colors given off from…

Temperature is a pretty weird thing if you think about it. How do you best define temperature? Let me go ahead and give you my favorite definition: Temperature is the thing that two objects have in common when they have been in contact for a long time. Yes, that is a good definition. Maybe now…

Models, photons, and more

Quantum mechanics is not my area of expertise. Really, I have no area of expertise. However, I think it is time to bring the whole photon thing back up. Yes, I know I was a little harsh before. Maybe I should start over. First, models. Yes models. I think science is all about models. Scientists…

[In part I of this post](http://scienceblogs.com/dotphysics/2008/11/interaction-between-light-and-matter-no-room-for-the-photon/), I struggled to show that a particle in an infinite well can only exist at certain energies. If you try to put a particle with more than one energy, the probability oscillates at a frequency (E2 – E1)/h. So, what is next? Well I think I am ready to…

One of the fundamental aspects of physics is the study of light and how that interacts with matter. I have been putting off this post – mainly because I am not a quantum mechanic (I am a classical mechanic). There are lots of things that could be done in this post, but I am going…