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 = β b = γ c = α

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a = α b = β c = γ

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a = X b = α c = β

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a = γ b = α c = X

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Solution

The correct option is B $a = α b = β c = γ$
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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