Why is an electric light bulb not filled with air? Explain why ar… - Vidyadip

Question

Why is an electric light bulb not filled with air? Explain why argon or nitrogen is filled in an electric bulb.

✓

Answer

If air is filled in an electric bulb, then the extremely hot tungsten filament would burn up quickly in the oxygen of air. So, the electric bulb is filled with a chemically unreactive gas like argon or nitrogen. Thes gases do not react with the hot tungsten filament and hence prolong the life of the filament of the bulb.

Need a full question paper?

Generate a complete, print-ready paper with questions like this in minutes — across 16+ boards, with answer keys.

Start Generating Free

Explore more

More "Answer the questions.[Phy-2M]" from Electricity→Electricity — all question types→Science STD 10 question papers→CBSE Board STD 10 question papers→CBSE Board question paper generator→

Similar questions

Explain why, if we look at objects through the hot air over a fire, the objects appear to be moving (or shaking) slightly.

Draw ray diagrams showing the image formation by a concave lens when an object is placed:

Between focus and twice the focal length of the lens.

A resistance of $25Ω$ is connected to a 12V battery. Calculate the heat energy in joules generated per minute.

Give the relationship between the wavelength of light and its angle of deviation, when it is passed through a prism.

When an object is placed at a distance of 36cm from a convex lens, an image of the same size as the object is formed. What will be the nature of image formed when the object is placed at a distance of:

10cm from the lens?
20cm from the lens?

How will you distinguish between a plane mirror, a concave mirror and a convex mirror without touching them?

State and define the SI unit of power of a lens.

Write the function of each of the following parts of human eye.

Cornea.
Iris.
Crystalline lens.
Ciliary muscles.

Describe with the help of a diagram, the nature, size and position of the image formed when an object is placed beyond the centre of curvature of a concave mirror.

Give two reasons why nichrome alloy is used for making the heating elements of electrical appliances.