What is the energy of each of the two photons produced in an electron-positron annihilation?
use the following joules-to-electron-volts conversion 1ev = 1.602 × 10-19 j.
the rest mass of an electron is 9.11×10^-31 kg

The average atmospheric pressure on earth is approximated as a function of altitude by the relation patm = 101.325 (1 − 0.02256z)5.256, where patm is the atmospheric pressure in kpa, and z is the altitude in km with z = 0 at sea level. determine the approximate atmospheric pressures at atlanta (z = 306 m), denver (z = 1610 m), mexico city (z = 2309 m), and the top of mount everest (z = 8848 m).