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Radioactivity

Why are parti...

Question

Why are particles least penetrating compared to $γ$ rays?

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Solution

Alpha and beta particles are both charged, so they slow down as they react with the cloud of electrons in matter. But gamma rays are not charged, so they keep on going. So they have more penetrating power.

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γ

-rays has least penetrating power.

β - p a r t i c l e s

have greater penetrating power than

α - r a y s

γ - r a y s

β - p a r t i c l e s

are lighter than

α - r a y s

but heavier than

γ

.

α -

β -

γ -

rays, each having an energy of

0.5 M e V

. Increasing order of penetrating of the radiations are:

α

β

γ

rays are all having same energy. Their penetrating power in a given medium, in increasing order, is,

α - p a r t i c l e s, β - p a r t i c l e s

γ - r a y s

, each having an energy of 0.5 MeV. In increasing order of penetrating powers, the radiations are

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