a.
- 1 – Alpha
- 2-Gamma
- 3 – Beta
b. 4. Beta rays are same as cathode rays
c. 92U238 → 82Pb206
Difference in mass number = 32
Mass number of one alpha particle = 4
Hence number of alpha particles = 8
Change in atomic number = 10
Change in atomic number due to alpha particles = 16
Charge of beta particles = -1
Hence number of beta particles emitted = 6