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Q: Which among the following is false about alpha particles?
  • A. They have high ionization power
  • B. They have high penetrating power
  • C. They have high kinetic energy
  • D. They are positively charged helium nuclei
Correct Answer: Option B - Alpha particles are mainly helium nuclei, these consist of two protons and two neutrons. In radioactivity, the particles are emitted by disintegration of the nucleus, their ionization potential and kinetic energy are very high but their penetrating capacity is weak.
B. Alpha particles are mainly helium nuclei, these consist of two protons and two neutrons. In radioactivity, the particles are emitted by disintegration of the nucleus, their ionization potential and kinetic energy are very high but their penetrating capacity is weak.

Explanations:

Alpha particles are mainly helium nuclei, these consist of two protons and two neutrons. In radioactivity, the particles are emitted by disintegration of the nucleus, their ionization potential and kinetic energy are very high but their penetrating capacity is weak.