Charges

Two charges, each with a value of +q are separated by a distance of l m. The resultant electric field and the potential measured at a point P a distance l/3 m from the left charge, are, 10 N/C and 2 V, respectively. What are the values of the distance l and the charge q?

Line Spectra and Energy Levels

I'm having trouble understanding the problem. What do you do? I'm so lost. What formula do I get to get eV? I've written all the KNOWNS that I know. I'm looking for someone to show me how to do this one, so I can do the rest of my homework.

Stopping Power for an Electron

The provided answer to #7 is 0.0383Mev/cm. I have n=4.7x10^29 and I=87.2eV for #7 but I missing something in the translation of equation and conversions. Please see the attached file for the two problems with equation.

Fission and Fusion

Fission is a process in which the nucleus splits into two parts that are roughly the same size of the original nucleus. In fusion, two nuclei fuse, or combine, to form one nucleus. These reactions seem to be opposite to each other and yet both release large amounts of energy. Explain why this is not a contradiction.

Accelerated particles: maximum kinetic energies in a cyclotron

If a cylcotron is capable of accelerating protons to 100MeV, maximum. What are the "approximate" maximum kinetic energies to which deuterons and alpha particles can be accelerated? I feel its just a simple proportional mass and velocity difference but I wonder if the difference in charge in cylotron is also considered?