00:01
In this problem, we'll be dealing with the concept of dimensional analysis.
00:05
So i've written down on givens.
00:06
We know that we're dealing with an alpha particle, helium, with a charge of plus two, and it has the mass of 4 .00151 atomic mass units.
00:17
So first we want to find the total charge of the helium atom, or nuclei, i guess.
00:24
So to do this, we're going to use dimensional analysis, and we know that in one, atom of helium, there are two protons because of the plus two charge.
00:40
And we know that one proton has a charge of 1 .6 times 10 to the negative 19 coulums.
00:50
So we're going to multiply this out and we get, let me erase this, we get 3 .20 times 10 to the negative 19th coulum per one atom.
01:05
Of helium.
01:10
And the protons cancel out and that's perfect.
01:14
Next we're going to convert the atomic mass units of helium into kilograms because our answer is in coolums per kilogram...