Q.

Which of the following has the highest penetrating power?

A. a-ray
B. b-ray
C. y-ray
D. δ-ray
Answer» C. y-ray
Explanation: The penetrating power is inversely related to size. Alpha particles, being the largest, penetrate the least. Gamma rays are the most penetrating of the radiations. They are highly energetic waves and are poor at ionising other atoms or molecules.
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