What is mean by radioactivity? Describe the nature an properties of ra – InterviewSolution

1.

What is mean by radioactivity? Describe the nature an properties of rays emitted by radio active substance.

Answer»

The phenomenon of spontaneous emission of radiation by heavy element is called radioactivity.

Example-U, P_o, Th, Ac. etc.

α-rays β-rays γ -rays

Commparision of properties of α,β &γ

S.N. Property	α-rays	β-rays	γ -rays
1. Nature	He⁺⁺	High speed electron	Electromagnetic wave
2. Rest mass	6.6 x 10^-27 kg	9.1 x 10^-31 kg	0
3.Charge	+3.2 x 10^-9C	-1.6 x 10^-19 C	0
4.Speed	1.4 x 10⁷ to 2.2 x 10⁷ m/s	equal to 1% to 99% of speed of light	3 x 10⁸ m/s
5. Ionisation capacity	100 times more than β ray	100 times more than Y rays	minimum
6.penetrating power	minimum	100 times more than α rays	100 times more

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