Assertion (A): Tungsten metal is selected for making filaments of incandescent lamp.Reason (R): Tungsten has a high melting point.
Question
Assertion (A):
Tungsten metal is selected for making filaments of incandescent lamp.
Reason (R):
Tungsten has a high melting point.
Solution
Assertion (A) is correct. Tungsten is indeed used for making filaments of incandescent lamps. This is because tungsten has a very high melting point of about 3422 degrees Celsius, which allows it to withstand the high temperatures generated when the lamp is switched on.
Reason (R) is also correct and it is the correct explanation for Assertion (A). The high melting point of tungsten makes it an ideal material for lamp filaments. When an electric current is passed through the filament, it gets heated up and starts glowing. If the material of the filament did not have a high melting point, it would melt due to the heat generated. Therefore, tungsten with its high melting point is the preferred choice for making filaments of incandescent lamps.
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