The emission of a beta particle has the effect a. decreasing mass by one unit /b. increasing mass by one unit / c. - no change in mass /d.- adding a proton to the nucleus / e. adding a proton of zero mass to the nucleus

The emission of a beta particle has the effect of : C. No change in mass

basically, beta particle has a very very little mass compared to the proton and  neutrons, so  little to the point that it never considered as a change in mass. But it does decreases the charge of atom

hope this helps

The air is going to come out because of the low pressure.

It can be classified based on its