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Question
Explain briefly why :
(a) α−particles cannot travel through the air for a long distance?
(b) γ−radiations can travel through the air for a long distance?
[5 MARKS]
(a) α−particles cannot travel through the air for a long distance?
(b) γ−radiations can travel through the air for a long distance?
[5 MARKS]
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Solution
Each Part: 2.5 Marks
(a) Because α−particles are least energetic than β−particles and γ−rays, so they suffer more collisions with the atoms when passing through in air. As they have high ionising power but less penetrating power, their energy is soon exhausted.
(b) Because γ−rays are the highest energetic rays, so they have a smaller rate of collision with the atoms (or molecules) of the medium through which they pass. Thus, they have less ionising power but more penetrating power.
(a) Because α−particles are least energetic than β−particles and γ−rays, so they suffer more collisions with the atoms when passing through in air. As they have high ionising power but less penetrating power, their energy is soon exhausted.
(b) Because γ−rays are the highest energetic rays, so they have a smaller rate of collision with the atoms (or molecules) of the medium through which they pass. Thus, they have less ionising power but more penetrating power.
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