Recent content by lanjarote

You can not create a electron positron pair from a single photon beacase yuo can not achieve simultaneously the conservationj of the momentum and the energy for the system. You need at least a collition between two height energy gamma ray photons. This reaction is the counterpart of the emision...

Entropy of a photon The entropy of a photon is dependent of how much do you know about it, if you know its propagation direction , and you know that it is a single particle then you have two posible states of spin (+/-1). So the entropy is S= log2(2) bits = k ln(2) juls/ºK

Excuse me , just for fun \begin{align*} \nabla \times \vec E = -\frac{\partial \vec B}{\partial t} \\ \nabla \times \vec H = \vec J +\frac{\partial \vec D}{\partial t} \end{align*}

:cry: I can't see the tex code when I click on the examples

:confused: But wait: I think you mistaked the values I have the for classical electron radious Ro= e^2 /(mc^2)= 2.82E-13 cm. and on the other hand, the compton wavelength LambdaC= h/mc= 24.3E-13 cm. ( m is the rest mass of the electron) and the ratio is really LambdaC/Ro= 8.61...

The ratio between both space magnitude are 6.2694, very close to 2*Pi. Sure it's really 2*Pi