Question

what is radioactivity?​

Answer 1

the emission of ionizing radiation or particles caused by the spontaneous disintegration of atomic nuclei.

Answer 2

★ Radioactivity :-

• Radioactivity is a phenomenon of spontaneous disintegration of certain nuclei into others due to emission of radiation like α , ß , γ
• radioactivity is a nucleus phenomenon. it does not depend on physical and external condition

Alpha particle

$\implies\bf{\alpha = _{2}^{4}He}$

Beta particle :-

• fast moving electrons originating from the nucleus

$\implies\bf{\beta = _{-1}^{\: \: 0}e}$

Gamma particle :-

• electromagnetic radiation of high energy

$\implies\bf{\gamma = _{0}^{0} \gamma}$

♣ Velocity :- α< ß < γ

♣ Penetration power :- α < ß < γ

♣ Ionization power :- α > ß > γ

• All the radioactive decay follow first order kinetics