SCIENCE
PHYSICAL SCIENCES
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Question
[CLICK ON ANY CHOICE TO KNOW THE RIGHT ANSWER]
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conducting electricity
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states
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chemistry
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chemical
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flammability
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Detailed explanation-1: -Q. Tungsten is used almost exclusively for filament of incandescent lamps because tungsten has a high melting point (3380∘C) and becomes incandescent (i.e., emits light at a high temperature) at 2400 K.
Detailed explanation-2: -Tungsten had enviable properties for a filament: the highest melting point of all elements, a white-hot glow, and the ability to render lifelike colors.
Detailed explanation-3: -Tungsten has low vapor pressure and hence will not produce tungsten vapors when heated. It has low thermal expansion coefficient and hence will not change its shape and structure when heated. This helps the filament not to get separated from the electrodes.
Detailed explanation-4: -tungsten has low resistivity but nichrome has high resistivity.