Recent content by Zong xiaobo

A particle is in the ground state of the 1D infinite square well (0<x<a). Suddenly the well expands, the right wall moving from a to 2a, leaving the wave function (momentarily) undisturbed. The energy of the particle is now measured. What is the most probable result, and what is its probability...

It seemed that I misunderstand what you said. when you mentioned mc^2, m is the rest mass. I always consider m as the relativistic mass.

I'm sorry, I made a mistake, the invariant mass of a photon is zero, however the relativistic mass of a photon isn't zero. I will give you a link:http://math.ucr.edu/home/baez/physics/ParticleAndNuclear/photon_mass.html

I think when a photon travel at a speed of c. The invariant mass of a photon isn't zero. So mc^2 isn't zero.

Thank you for the links

Thanks a lot!

It seemed have answered my question. I will read the paper first.

I think when the mc^2 is zero, p must be zero. So the E=pc must be zero.

f is the frequency of a particle. In the theory of relativity, energy equals m*c*c. In the theory of Photoelectric effect, energy equals h*f If the particle keeps still. m is the rest mass of the particle. In this case the frequency is 0 and h*f is 0...