The ionising power of α, β, and γ-rays is in the decreasing order :
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Ionizing power refers to the ability of radiation to knock electrons out of atoms, creating ions. It depends on the particle's charge, mass, and speed.
Alpha particles () are heavy and doubly charged, so they interact strongly with matter, losing energy quickly and ionizing many atoms. Beta particles (high-speed electrons) are lighter and singly charged, so they interact less and have lower ionizing power. Gamma rays are photons with no charge or mass, so they interact very weakly and have the least ionizing power.
Therefore, the correct order is α > β > γ.
Final Answer: α > β > γ