Which statement describes the arc lamp's light production?

Which statement describes the arc lamp's light production?

• A. Arc lamp produces light via dielectric breakdowns
• B. Arc lamp relies on heating a filament
• C. Arc lamp relies on phosphorescence
• D. Arc lamp uses chemical luminescence

Answer: (A)

Arc lamps produce light when a strong electric field causes the gas between two electrodes to undergo dielectric breakdown, forming an arc discharge. This ionizes the gas and creates plasma, and the excited atoms emit light as the electrons recombine and transitions occur. This mechanism is different from heating a filament (incandescence), phosphorescence (glow from excited phosphors after excitation), or chemical luminescence (light from a chemical reaction).

Arc lamps produce light when a strong electric field causes the gas between two electrodes to undergo dielectric breakdown, forming an arc discharge. This ionizes the gas and creates plasma, and the excited atoms emit light as the electrons recombine and transitions occur. This mechanism is different from heating a filament (incandescence), phosphorescence (glow from excited phosphors after excitation), or chemical luminescence (light from a chemical reaction).