Consider the following statements An ordinary light bulb has a rather short life because the 1 filam......

Consider the following statements:
An ordinary light bulb has a rather short life because the:
1. filament wire is not uniform.
2. bulb cannot be evacuated completely.
3. wires supporting the filament melt at high temperatures.

Which of the above statements are correct?

1, 2 and 3

-The electric light bulb uses a glowing wire filament heated by electrical resistance to white to generate light a process known as thermal radiation. The bulb is the glass enclosure which keeps the filament in a vacuum or low-pressure noble gas. Complete evacuation of bulb is not possible. A small quantity of gases left behind which expands on heating by heat through filament. Moreover the wires supporting the filament sometimes melt due to high heat generated as a result of high resistance of filament. Thus these factors leads to short life span of ordinary bulb.

By: Abhipedia