Alpha particles travel through the air they collide with oxygen and nitrogen molecules. While they collide with these molecules, they lose some energy until all energy are used up and they are absorbed. These particles can be absorbed by a sheet of paper or by the air. On the other hand, beta particles and gamma particles move faster than the alpha particles and are poor at ionizing atoms or molecules thus it takes more of the material to be able to absorb these particles.
B. False
Endothermic reactions absorb heat.
With smaller mass, object should be more denser in order to have equal landmass.
Mars should be more denser, if it has equal landmass.
But in reality, it's landmass is not equal 'cause it's density is about 72% of that of earth.
Hope this helps!
