Discussion
Which of the following rays are more penetrating?
Answer: C
Gamma rays are the most penetrating of the radiations listed. They are high-energy electromagnetic waves with no charge and no mass, and need several centimetres of lead or a metre of concrete to stop them.
Alpha particles are stopped by a sheet of paper and beta particles by a few millimetres of aluminium. X-rays are of the same nature as gamma rays but of lower energy.
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