Question

what happens to conventional incandescent light bulbs after use?
they remain cool to touch.
they are very hot to touch.
they emit a pleasant fragrance.

Explanation:

Conventional incandescent bulbs produce light by heating a tungsten filament to extremely high temperatures (around 2500-3000°C). Most of the energy is lost as heat, so after use, the bulb's surface retains significant residual heat.

Answer:

B. They are very hot to touch.