Arrange $α, β$ and $γ$ -rays in ascending order with respect to their ionising power.

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Solution

Ionising power refers to the energy required to remove an electron from an atom.
$α$ -rays are positively charged, therefore they have more ionising power and since $γ$ do not have any electric charge they have low ionising power.
Arranging in ascending order with respect to their ionising power, $γ < β < α$ .

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