Range of alpha particles.

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The range of α-particles is customarily defined as the distance which these particles travel through air at 76cm of mercury pressure and 15°C temperature before they lose their energy to the extent that they no longer ionise the gas particles.
★The range of α-particles depends upon the following factors
(i) Initial velocity of α-particle
(ii) Nature of emitting radioactive element
(iii) Nature & pressure of the gas or nature of absorber.

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