nuclear chemistry

i think its B

it's d

on wat basis we compare the penetrating power of any two things

The alpha particle is a fast moving packet of two protons and two neutrons , expelled as a single particle from a disintegrating nucleus . Because alpha particles produce such heavy ionisation per centimeter of travel we would expect them to travel much shorter distances before their energy is expended. This is in fact the case; they have very little penetrating power.

Beta particles are more like electrons. Beta particles are much more penetrating than alpha particles because of their low ionisation power of travel.

thnks joydoot