Nuclei - Result Question 89
91. The most penetrating radiation of the following is
[1997]
(a) gamma-rays
(b) alpha particles
(c) beta-rays
(d) $X$-rays
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Answer:
Correct Answer: 91. (a)
Solution:
- (a) The penetrating power of radiation is directly proportional to the energy of its photon.
Energy of a photon $=\frac{h c}{\lambda} \propto \frac{1}{\lambda}$
$\therefore$ Penetrating power $\propto \frac{1}{\lambda}$
$\lambda$ is minimum for $\gamma$-rays, so penetrating power is maximum of $\gamma$-rays.
