question_answer 24)

In an accelerator experiment on high-energy collisions of electrons with positrons, a certain event is interpreted as annihilation of an electron-positron pair of total energy 10.2 BeV into two y-rays of equal energy. What is the wavelength associated with each  ? (1 BeV = 109 eV)  

Answer:

Energy carried by the pair of = 10-2 BeV Energy of each  ray is  Using