# Recent content by JamesJames

1. ### Possibility of pair Production without interaction with matter?

I can rewrite that equation with brackets (E)^2 = (pc)^2 + (mc^2)^2 tells me that E must always be greater than pc, where p = |p|. This is ONLY true if m is non-zero, because if m = 0, then E = pc. So, in my final equation, have 2(E+)(E-) + C = 2(p+)(p-)cosx where C = (mc^2)^2...
2. ### Possibility of pair Production without interaction with matter?

ok, I think I finally got what you are saying. Its making sense. The picture is forming correctly for me now. I tried balancing equations and one last question remains though: When you guys let c = 1 in E^2 = p^2*c^2 + m^2*c^4, could I be able to show that E^2 is always larger than p^2*c^2...
3. ### Possibility of pair Production without interaction with matter?

Thanks, that rest term should not be there. I think I understand some part of the Meir's post now. Here's the way I understand it...my question is at the end: E^2 = p^2 c^2 + M^2 c^4, where M = m[0] let c = 1 I can see that it must hold for the conservation to be valid. Just to...
4. ### Possibility of pair Production without interaction with matter?

For both energy and momentum, I have moving photon + Rest term = sum of 2 energies + rest term. Perhaps, I need to back up: What does the earlier post mean physically when the following is said: "For a photon, E^2-P^2=0. For any number of massive particles, E^2-P^2>0." What is the...
5. ### Possibility of pair Production without interaction with matter?

Perhaps I;'m not correctly understanding what is physically going on. I can see that |p(photon)|=E(photon), so that part is fine. But I am confused about the other two equations: |p(e+)|<E(e+) |p(e-)|<E(e-) How do they come about in relation to this problem? Also, why does...
6. ### Possibility of pair Production without interaction with matter?

Are you saying that because E^2 + p^2*c^2 = m^2*c^4? This way since m^2*c^4 is always greater than zero, the left side must always be non zero. But , how does this show the connection to interaction? Also, I should calrify my equation: Conservation of Energy E(photon) + m*c^2 = E(photon')...
7. ### Possibility of pair Production without interaction with matter?

1. Homework Statement Is it possible for pair production to occur without interacting mwith matter? 2. Homework Equations E+ + E- = E(gamma) - 2*m_e*c^2 3. The Attempt at a Solution In the Coulomb field of nucleus (or electron), the incident photon energy can be converted to...
8. ### Equations of motion and proper Significant Digits.

Your help would be greatly appreciated. I feel like I am close but just need some help finishing off the problems.
9. ### Equations of motion and proper Significant Digits.

1. Homework Statement Solve the following to the proper number of significant figures: a) A loaded truck has mass (2.12 X 10^4 +/- 6 X 10^2) kg and when empty, it has a mass of (1.72 X 10^4 +/- 5 X 10^2) kg. What is the relative uncertainty of the mass of the gravel dumped from the...
10. ### Near Normalization calculation for given wavefunction

Near "Normalization" calculation for given wavefunction 1. Homework Statement A wave function is given by Y(E) = CEexp(-E/kt) 1. Find C so that Y(E) becomes Y0 where Y0 is a constant. 2. Calculate the mean energy with respect to Y(E). 3. Find Y(t) as a function of wavelength...
11. ### Questions on Future Job Market

What kind of a company did you have in mind? And what types of duties would you associate with that position?