Alpha particles are least penetrating because they:

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Alpha particles are relatively heavy (4 amu) and doubly charged (+2), so they interact strongly with matter, losing energy rapidly via ionization. They can be stopped by a sheet of paper or a few centimeters of air. Beta particles (lighter, faster electrons) penetrate further. Gamma rays (uncharged EM waves) are most penetrating. Alpha emitters are hazardous if ingested or inhaled.

Alpha particles are least penetrating because they: MCQ with Answer and Explanation

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