1.

Define Radioactivity. Write the nature,properties and difference among α,β and γ rays.

Answer»

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

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

α-rays  β-rays  γ -rays

Commparision of properties of α,β &γ 

S.N. Propertyα-raysβ-raysγ -rays
1. NatureHe++High speed electronElectromagnetic wave
2. Rest mass6.6 x 10-27 kg9.1 x 10-31 kg0
3.Charge+3.2 x 10-9C-1.6 x 10-19 C0
4.Speed 1.4 x 107 to 2.2 x 107 m/sequal to 1% to 99% of speed of light 3 x 108 m/s
5. Ionisation capacity100 times more than β ray100 times more than Y raysminimum
6.penetrating powerminimum100 times more than α rays100 times more



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