Generals 2002 II 2B

From PlasmaWiki

[edit] Part 1

Helium has a lower minimum breakdown voltage than air because collisions of electrons with air molecules can be inelastic. In addition, it is possible to form negative ions with these gases.

[edit] Part 2

Exponential decay would likely be due to diffusion, since $dn/dt\propto D\partial^{2}n/\partial x^{2}\propto-n$ . A decay like $t - 1$ would probably be due to recombination, since for this process, $dn/dt\propto-n^{2}$ .