The ionising power of - - and -rays is in the decreasing order-

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Properties of Alpha, Beta and Gamma Radiations

The ionising ...

Question

The ionising power of $α$ , $β$ and $γ$ -rays is in the decreasing order:

α > β > γ

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β > α > γ

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γ > α > β

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β > γ > α

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Solution

The correct option is A $α > β > γ$
The $α$ particles are a helium nucleus and the most heavy of the three so hits more particles on its travels so can’t travel as far but ionizes more along its way.
The $β$ particles are highly energetic electrons that, being smaller than $α$ particles, can travel further but ionize less.
The $γ$ particles are highly energetic photons that rarely interact with matter so can travel very far and ionize the least.

Ionisation power order
$α > β > γ$

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The ionising power of α, β and γ-rays is in the decreasing order:

The ionising power of $α$ , $β$ and $γ$ -rays is in the decreasing order: