Modern Physics 3 Question 20
20. Consider $\alpha$-particles, $\beta$-particles and $\gamma$-rays each having an energy of $0.5 MeV$. In increasing order of penetrating powers, the radiations are
(1994, 1M)
(a) $\alpha, \beta, \gamma$
(b) $\alpha, \gamma, \beta$
(c) $\beta, \gamma, \alpha$
(d) $\gamma, \beta, \alpha$
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Solution:
- Penetrating power is maximum for $\gamma$-rays, then of $\beta$-particles and then $\alpha$-particles because basically it depends on the velocity. However, ionization power is in reverse order.
