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:

  1. 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.


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