# 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 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?
12. ### Schools Thought about graduate school and

Anyone? Surely someone can offer some suggestions.
13. ### Serious Help Needed Please

Agreed..I did the same.
14. ### Serious Help Needed Please

Exactly! I would highly recommend speaking the professor as each University/College teaches different material in similar courses and that could have different effects on different students. His feedback should ultimately be the deciding factor for you, when deciding whether to take or not...
15. ### Serious Help Needed Please

I know that the Engineering program at my University requires Engineers to take a fall semester of "Electronics I" which covers all of the topics in your Electric Circuit I except for PSPICE which is done during the first lab of the winter semester in "Electronics II". The Ordinary Differential...