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Question

The following picture shows three types of radiation a, b, and c penetrating through three different materials.

Which of the following matches is correct?

A
a=βb=γc=α
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B
a=αb=βc=γ
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C
a=Xb=αc=β
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D
a=γb=αc=X
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Solution

The correct option is B a=αb=βc=γ
The higher the energy, the more the particles or rays produced by radioactive decay would penetrate a substance.
  • Alpha particles have the least penetrating power. They cannot penetrate through air for more than 8-10 cm, and can easily be obstructed by a thin paper or skin.
  • Beta particles have more penetrating power than alpha particles, up to a few metres in air, but are easily obstructed by a thick cardboard or any metal sheet.
  • Gamma rays have the most penetrating power, up to a few hundred metres in air. They can only be stopped by concrete or lead walls of thickness of a few feet.

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