An electron and a positron undergo pair annihilation, producing two gamma ray ph

Question

                    An electron and a positron undergo pair annihilation, producing two gamma ray photons:
                    
                

                    e- + e+ ? 2?.                 

                    
                    
                    If they had approximately zero kinetic energy before the annihilation, what is the wavelength of each Y ?
                

                                     Please type out final answer.

Explanation / Answer

electron and positron mass=9.109x10^?31 kg

E=mc^2

E=(9.109x10^-31)x(9x10^16)

E=8.198x10^-14joules

E=hf=hc/wavelength

wavelength=hc/E

=(6.626x10^-34)x(3x10^8)/(8.198x10^-14...

=2.425x10^-12m=2.425pm

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