# Search results

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?

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...

Thought about graduate school and.... I am a senior undergraduate student in Physics (last year is in progress with a GPA that is very close to a B+)..have been around these forums for nearly 2 years now and would like to ask a few questions regarding post-undergrad opportunities. I am...
17. ### Spatial filtering

Anyone? I' m sure someone can help me.
18. ### Spatial filtering

I am confused by this Abbe thoery thing involvign the use of an optical computer. A laser is focused onto a 10 μm screen with adjustable micrometer screws. A pinhole is provided to avoid any unnecessary dispersion of the laser beam. The first lens converts spherical wavefronts into plane...
19. ### IE and spyware

Is the opera browser better at preventing Spyware?
20. ### .tex file won

Any suggestions?
21. ### .tex file won

It is 22.4 kb roughly the same size as the other ones....the ones that open fine.
22. ### .tex file won

.txt file infact. Is there any chance of recovering the information?
23. ### Lock In Amplifier

Is there a book or website that explains throughly how to use a Lock In Amplifier? I have never used one before and am using it in a Johnson Noise experiment with the "Art of Experimental Physics by Preston and Dietz" acting as the lab manual.
24. ### .tex file won

I am trying to open a .tex file. When I clicked on it, it asked what program I wanted to use to open the thing. So I selected wordpad. The thing opened up in wordpad with a blank document. When I selected print preview, it allowed me to scroll through 4 blank pages. Here' s the...
25. ### Can the logical state really be determined during this time?

Anyone? I; m a bit confused about this subject to say the least. It would really help if I could get some clarification.
26. ### Can the logical state really be determined during this time?

Using a 555 timer (square wave input) as a NOT gate, can the logical state (0 or 1) be determined during rise and fall times? I would think that this is some kind of discontinuity during which the properties of the wave are not known but am not very sure about the logical state thing. It is...
27. ### Underdamped oscillations in an LC circuit

So what you are saying is that it is impossible to use square wave pulses to induce damped oscillations in a circuit consisting of L and C. Instead, application of such a wave pulse would induce FORCED or DRIVEN HARMONIC OSCILLATIONS. Here' s the thing and I apologize for not posting this...
28. ### Underdamped oscillations in an LC circuit

Anyone? I have made an attempt on my own.
29. ### Underdamped oscillations in an LC circuit

A square wave pulse (generated using an oscilloscope) is used to induce damped oscillations in a circuit that consits of an inductance L and a capacitance C connected in series. A resistance is present even though no resistor is present in the circuit. a) Find the differential equation for...
30. ### A Fourier Optics experiment

Anything mathematical would be of great help for the low pass filter and for the above post, it does not need to the be mathematical.