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Which of the following material has the highest melting point?
1. Copper
2. Aluminium
3. Tungsten
4. Gold

1 Answer

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Best answer
Correct Answer - Option 3 : Tungsten

Explanation:

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
  • As the resistance is lessheat 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 = 3380 K) and the highest tensile strength of any element. Therefore option 3 is correct.
  • 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. 
  • 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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