Question

temperature depends on the average kinetic energy of the particles in a sample. how does this help explain why a plasma - based light does not have a high temperature?

• no particles in the plasma have high kinetic energy.
• the fastest particles have the greatest mass.
• most particles in the plasma are heavy, slow, and very low density.
• the fastest particles transfer most of their energy through collisions.

Explanation:

To solve this, we analyze each option:

• Option 1: Plasma has charged particles with some high - energy ones, so this is wrong.
• Option 2: In plasma - based lights (like neon lights), the fast particles (electrons) have very small mass, not the greatest. So this is incorrect.
• Option 3: Plasma in these lights has low - density, heavy (ions) and slow particles on average. Since temperature is average kinetic energy ($KE=\frac{1}{2}mv^{2}$), low average KE (from heavy, slow particles) means low temperature. This fits.
• Option 4: Energy transfer via collisions doesn't directly explain low average KE related to temperature. So this is not the right reason.

Answer:

C. Most particles in the plasma are heavy, slow, and very low density.