Question

How can we lower the operating pressure required to sustain a plasma?

A. Use bigger molecules in the gas to make it easier for the electrons to find and collide with them.

B. Once the minimum pressure required to sustain a plasma is passed the plasma can not be sustained.

C. Make sure the gas is charged positive in order to make it easier for electrons to find and collide with them.

D. Adding a magnetic field will cause the electrons to spiral around the field lines which will increase their chances of striking a molecule. The radius of curvature is proportional to the momentum over the field strength. Since an electron has very little mass its radius is much smaller than for a much heavier ion with the same energy.

Answer 1

Answer will be part A .

heres a brief explanation :

When first the plasma is generated it has to pass through cool, slow moving gas which is not in and of itself energized, then (as described by both thermodynamics and entropy) as the plasma forms it will release heat into the environment (its hot) which will ionize the gas creating an area in which the plasma can more easily exist, it will be under lower pressure, have more energy available from the environment.