annihilation

Question 1

ANNIHILATION

Answer 1

:when a particle meets its own antiparticle, they destroy each other

Question 2

annihilation

Answer 2

all the mass of the particle and antiparticle turns into energy E=mc^2
e.g. e^- + e^+ –> 2y

Question 3

REST ENERGY

Answer 3

if a particle is totally annihilated, it’s mass is converted into energy (E=mc^2)
:this means the mass of a particle can also be given in energy units - rest energy
- 1MeV = 10^6 eV = 10^6 x 1.6x10^-19 joules

Question 4

rest energy

Answer 4

if an electron and positron annihilate the total rest energy is 2 x 0.511(data sheet) = 1.022MeV
the energy released = 1.022MeV= 1.022 x 10^6 x 1.6x10^-19