A) X-rays
B) \[\gamma -\]rays
C) \[\beta -\]rays
D) \[\alpha -\]rays
Correct Answer: D
Solution :
As it is clear that penetrating power of a-rays is few cm. While the penetrating power of\[\beta ,\gamma \]and X-ryas is in metre. Hence, the a-rays has the minimum penetrating power.
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