Write down the Properties of α - rays :

1.	Write down the Properties of α - rays :
Answer» Properties of α-rays : (i) α-rays consist of doubly ionised heliurn atoms. (ii) α-rays are deflected by the electric field and the magnetic field. (iii) α-rays carry positive charge of 3.2 x 10^-19C (iv) The velocity of α-rays is about 10% of the velocity of light. (.r) o-rays affect the photographic plate. (vi) α-rays are absorbed by thin foils. For example, an aluminium foil 0.01 cm thick is sufficient to absorb them. In air at normal pressure, they may penetrate up to 3 to 4 cm. (vii) α-rays ionise the gas through which they pass. A single α- parficle can ionise even up to 20,000 gas atoms. (viii) α- rays fluorescence in zinc sulphide, barium platinocyanide, etc. (ix) α- rays get scattered by the thin foils.

Answer»

Properties of α-rays :

(i) α-rays consist of doubly ionised heliurn atoms.

(ii) α-rays are deflected by the electric field and the magnetic field.

(iii) α-rays carry positive charge of 3.2 x 10^-19C

(iv) The velocity of α-rays is about 10% of the velocity of light.

(.r) o-rays affect the photographic plate.

(vi) α-rays are absorbed by thin foils. For example, an aluminium foil 0.01 cm thick is sufficient to absorb them. In air at normal pressure, they may penetrate up to 3 to 4 cm.

(vii) α-rays ionise the gas through which they pass. A single α- parficle can ionise even up to 20,000 gas atoms.

(viii) α- rays fluorescence in zinc sulphide, barium platinocyanide, etc.

(ix) α- rays get scattered by the thin foils.

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