What is the minimum energy released in the annhilation of an electron positron pair?

The miniumum amount of energy released in annihilation of electron-Positron is

Calculate the amount of energy set free by the annigilation of an electron and a positron. Given that mass of electron = 0.00055 amu and positron = 0.00055 amu.

In an accelerator experiment on high energy collision of electrons with positrons, a certain events is interpted as annhilation 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)

The minimum energy required to remove an electron is called

What is the amount of energy released by deuterium and tritum fusion ?

Configuration that shows the highest energy released when an electron is added to the atom is

What is the name given to the minimum energy of incident radiation required to free an electron from the surface of a metal?