Multiple choice

Which of the following has the least penetrating power?

  1. Alpha particles

  2. Beta particles

  3. Gamma rays

  4. All have the same penetrating power
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

Alpha particles have the least penetrating power because they are heavy (helium nuclei) and carry double positive charge, causing them to interact strongly with matter. They can be stopped by a sheet of paper or few centimeters of air. Beta particles (electrons) penetrate further, and gamma rays (high-energy photons) have the highest penetration, requiring dense materials like lead for shielding.

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