Question

what is a common human - made application of plasma?
a birthday cakes
b fluorescent light bulbs
c drinking water
d party balloons

Explanation:

• Birthday cakes: Mainly involve physical mixing of ingredients (flour, sugar, etc.) and baking (a thermal process), no plasma application.
• Fluorescent light bulbs: Work based on the principle of plasma. Inside the bulb, there is a low - pressure gas (usually mercury vapor). When an electric current is passed through, the gas is ionized to form a plasma. The excited atoms in the plasma emit ultraviolet light, which then causes the phosphor coating on the inside of the bulb to fluoresce (emit visible light).
• Drinking water: Is in the liquid state (a common state of matter, not plasma). It may involve processes like purification (filtration, chemical treatment) but no plasma.
• Party balloons: Usually filled with gases like helium (inert gas for floating) or air. These are in the gas state (not plasma) and are used for their buoyancy or to fill space, no plasma - related mechanism.

Answer:

B. Fluorescent light bulbs