Here are some hints for Assignment 9 in WebAssign:
Throughout the assignment the symbol e may appear with or without a superscript for its electric charge. If there is no superscript on the symbol e, then it stands for an electron, which of course is negatively charged.
In Question 1, assume for reactions that the projectile has enough energy to allow the reaction to occur. Momentum violation is the correct answer only in those cases where the reaction or decay can't occur no matter how energetic the incident particle(s) are.
In Question 6 WebAssign is considering strangeness to be an applicable conservation law in the hypothetical decay of the proton. So go ahead and mark strangeness if it is violated in any of the hypothesized proton decays. In reality, strangeness conservation is not applicable in proton decay.
In Question 7(b) the wording is misleading. They are really asking for the kinetic energy of the FIRST projectile particle only, not the sum of the kinetic energies of both projectiles.
In Question 8 assume for reactions that the projectile has enough energy to allow the reaction to occur.
This page is maintained by
Prof. Mohan Kalelkar.