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

General Science (Easy) Physics

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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

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Explanation:

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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