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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 and 3
2 and 3
1 and 2
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.
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