Question

Which of the following types of radiation can penetrate through paper but not through wood?

A. Alpha rays

B. Beta rays

C. Gamma rays

D. Proton rays

Answer 1

alpha radiation can be stopped by a few cm of air or thin sheet of paper
beta radiation can be stopped by a few mm of metals like aluminium
gamma rays can be most stopped by a thick layer of steel or concrete, but even a few cm of dense lead doesn't stop all of it!
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