.Homework Lecture 11 Name Morning Noon Afternoon Rev 8 11-1. Describe how a radiation, ? radiation, ? radiation, positron emission and electron capture differ in terms of the following. Radiation Particle produced Change in atomic number Change in mass Penetrating number power a radiation B radiation y radiation positron emission Solution 11-1. Sol:- Explanation :- Properties of alpha particle:- 2 He 4 is the alpha particle i.e alpha particle contains 2 protons and 2 neutrons . mass of alpha particle is four times the mass of proton ( 1 H 1 ) . alpha particles ionise the gas through which they pass and therefore alpha particles have very low penetration power . Properties of beta particle :- -1 e 0 is the beta particle in which decrease in atomic number by 1 unit and no change in mass number . a beta particle is lighter than alpha particle and the penetration power of beta particles is 100 times more than alpha particles . Properties of gamma particle :- 0 gamma 0 is the gamma particle in which there is no change in mass number as well as atomic number . the ionization power of gamma particle is very low as compared to alpha and beta particle . penetration power of gamma particle is very high which is 10000 times more than alpha particles . Positron emission :- +1 e 0 is the positron particle in which atomic number is increased by 1 unit while there is no change in mass number .penetration power of positron is negligible because positron is very unstable and readily decomposes . .