In an accelerator experiment on high energy collision of electrons with positrons, a certain events is interpreted as annihilation of an electron-positron pair of total energy 10.2 BeV into two `gamma`-rays of equal energy. What is the wavelength associated with each `gamma`-rays? `(1BeV=10^(9)eV)`

Explanation

Use `lambda=(hc//E)" with " E=5.1xx1.602xx10^(-10)J" to get "lambda=2.43xx10^(-16)m`.