Recent content by flame_cmh

We know that the velocity of sound has relation with the pressure of the medium. And I'm wondering wether it has relation with the pressure of radiation ? Thanks!

I understand you, and thanks for your time!

Ok, I get it, and thanks! Maybe that's why it takes so long to get a reply on the thread, cause I asked a stupid question!^_^ This question originally came out from that I read the lectures of Feynman on polarization of the light! So I think if a source shot out a unpolarized light, according...

Suppose that two photons are the same and propagation in opposite direction in vacuum, the energy of this system of course is 2h*\nu. When they coincide in position, according to the principle of superposition there is no electric and magnetic field, then the energy disappear at that time??