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Consider $\;\alpha\;, \beta \;, \gamma\;$ rays each having an energy 1 MeV . Arrange them in increasing order of penetrating powers of radiation.

$(a)\;\alpha , \beta , \gamma\qquad(b)\;\beta , \gamma , \alpha\qquad(c)\;\alpha , \gamma , \beta \qquad(d)\;\gamma , \beta , \alpha$

1 Answer

Answer : (d) $\; \gamma , \beta , \alpha$
Explanation :
Penetrating power is maximum for $\;\gamma -\;$ rays then of $\;\beta - \;$ particles and then $\;\alpha -\;$ particles because basically it depends on velocity . However ionization power is in reverse order .
Alpha (α) radiation consists of a fast-moving helium-4 (4He) nucleus and is stopped by a sheet of paper.
Beta (β) radiation, consisting of electrons, can be halted by an aluminium plate.
Gamma (γ) radiation, consisting of energetic photons, can be absorbed only as it penetrates a dense material.
answered Mar 6, 2014 by yamini.v
edited Apr 2, 2014 by balaji.thirumalai

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