Filament lamb is a device on lighting effect of electric current (a) write material is used to make the filament (b) write any four characteristic property of this material
Answers
Explanation:
filament of an electric bulb:
When choosing a material for a particular application, many different properties of materials must all be considered together (such as: melting point (MP), boiling point (BP), thermal conductivity, electrical resistivity, cost, etc.).
Incandescent light bulbs use heat generated by the resistance of the filament to create light by something called black body radiation. To get white light you need the filament to reach 2700-3300K to give off white yellow light. The reason tungsten is used is because it has the highest melting temperature of any element at 3600K.
For a typical incandescent light bulb, the Tungsten filament operates at approximately 2500 Celsius.
Hence, the filaments are made of tungsten
Explanation:
Tungsten is used to make a filament of a bulb.
Characteristics: Tungsten is a very hard, dense, silvery-white, lustrous metal that tarnishes in air, forming a protective oxide coating. In powder form tungsten is gray. The metal has the highest melting point of all metals, and at temperatures over 1650 oC also has the highest tensile strength.