Question

The metal wire in an incandescent lightbulb glows when the light is switched on and stops glowing when it is switched off. Which kind of a change is seen in this process? . .
a physical change. .
a chemical change . .
a nuclear change . .
an ionic change.

Answer 1

Ionic change’ is the closest answer - electric currents are conducted by ions in some substances, though not metal. The filament - metal wire - in an incandescent lightbulb glows with visible light because it is heated to a very high temperature by an electric current being passed through it. It is not a physical change because this generally involves change from one state to another — for example, solid to liquid. Chemical changes usually result from chemical reactions.