Question
Download Solution PDFTungsten is used for making bulb filaments of incandescent lamps because:
Answer (Detailed Solution Below)
Detailed Solution
Download Solution PDFCONCEPT:
Tungsten:
- The metal tungsten is used for the filaments in incandescent bulbs.
- It has a high melting point and retains its strength when heated.
- Filaments of the light bulbs are made up of the Tungsten element.
- Its symbol is ‘W’ because of its scientific name ‘Wolfram’ and its and the atomic number 74.
EXPLANATION:
- As the resistance is less, heat energy is produced is very low which is not sufficient for an electric bulb to glow so the resistance is kept high.
- Tungsten is very resistant to corrosion and has the highest melting point (melting point = 3695 K) and the highest tensile strength of any element.
- Tungsten is used for making bulb filaments of incandescent lamps because it has the highest melting point and does not melt even while it is glowing for long hours. Therefore option 4 is correct.
NOTE:
- Light bulb filaments aren't resistive because of the tungsten.
- They're resistive because of their very long length, and very thin wire.
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