vikas askiitian expert
Last Activity: 13 Years ago
in gama decay there is no change in mass number...
initially nucleous was at rest ,due to internal forces it will move after giving a gamma photon..
so we can apply conservation of momentam here
final momentam = initial momentam = 0
P(gamma photon) + P(nucleous) = 0 .......................1
energy of photon = 7Mev
p(photon) = E/c (c is speed of light , E =7Mev (given) )
p(nucleous) = -E/c ( from eq 1)
kinetic energy = P2/2m = E2/2mc2
now put E , C & m ,u will get the 1.1Mev ans