Corrections to Physics Problem Set #7 solutions

There was some mistakes in the originally posted Physics Problem Set #7 solutions – I apologize for my mistake. Thanks to those of you who noticed them and brought them to my attention. If you printed out the solutions prior to 7:00 pm Sun. Feb.24, you have a version with the mistakes. I have posted an updated version with corrections Here are the correction so you don’t need to print out an entirely new version:
- Problem 2: the originally posted solution mistakenly added 15 + 5 to get 15 GeV for E₃. Of course, 15 + 5 actually equals 20, so E₃ = 20 GeV. This makes u₃ = 0.6c, and m₃ = 16 GeV/c².
- Problem 5: minor typo error in final answer for E₁. E₁ = 2.0 MeV.
- Problem 8: the originally posted solution mistakenly used 7.5 GeV/c² as the mass of particle B instead of the 1.0 GeV/c² given in the problem statement. Using the mass given in the problem statement, the corrected mass for particle A should be m_A = 3.414 GeV/c².
- Problem 9: switched the energies for the left-moving and the right moving photon. The left-moving photon has energy 4 GeV, and the right-moving photon has energy 12 GeV.