Electrons have a rest mass of 9.1095x103"kg(0.511 mev/c2) and an energy of 0.511 mev million electron volts) when at rest. in a colliding beam experiment, a beam of electrons accelerated to a high speed is sent toward a beam of antielectrons (same mass as electrons) moving in the opposite direction at the same speed. a.) experimenters hope to create the j/y particle that has a rest mass energy of 3097 mev through one of these collisions. the j/y particle is made up of a combination of a charmed quark and its antiparticle. how is it possible to create a particle whose mass is greater than the sum of the masses of the particles that collide? b.) what speed is necessary for the electrons? develop a formula for v/c in terms of the energies and masses described in part a plus the intro to the problem. you don't have to solve for the number c.) draw a feynman diagram for the process

How does the space charge width change with forward and reverse bias? also, calculate the space charge width for a reverse bias of 4v on a silicon pn junction at t = 300k and doping concentrations of na = 5x1015cm-3 , nd = 5x 1016 cm-3 .

First, launch the video below. you will be asked to use your knowledge of physics to predict the outcome of an experiment. then, close the video window and answer the question at right. you can watch the video again at any point. part a as in the video, we apply a charge +q to the half-shell that carries the electroscope. this time, we also apply a charge –q to the other half-shell. when we bring the two halves together, we observe that the electroscope discharges, just as in the video. what does the electroscope needle do when you separate the two half-shells again? view available hint(s) as in the video, we apply a charge + to the half-shell that carries the electroscope. this time, we also apply a charge – to the other half-shell. when we bring the two halves together, we observe that the electroscope discharges, just as in the video. what does the electroscope needle do when you separate the two half-shells again? it deflects more than it did at the end of the video. it deflects the same amount as at end of the video. it does not deflect at all. it deflects less than it did at the end of the video. submit

Suppose a wire with a current is pushed upward by a magnetic field. how would the wire move if the direction of the current reversed? explain your answer.