why is tungsten used for light bulb filaments

Answer 3: The incandescent bulb emits light through black
body radiation. This is the process by which every object with heat is constant emitting electromagnetic radiation. The wavelength of the radiation that is emitted depends on the temperature of the object. All electromagnetic radiation has a wavelength, long wavelengths from 100 meters to 1 millimeter comprise radio waves, going to smaller wavelengths from roughly 100micrometer to 750 nanometers is what we call infrared radiation, and 750nm (red) to 400nm (blue/violet) is visible light. At even smaller wavelengths there is ultraviolet, x-rays, and gamma rays.


You probably know that an infrared camera can see a person in complete darkness because people give off infrared radiation, because we are at a temperature of about 37 degrees celsius. At higher temperatures the wavelengths emitted are shorter. In order to emit light that we can see, i. e. 750nm to 400nm,the filament of the bulb needs to be at a temperature of about 3000degrees celsius, which is incredibly hot. Nichrome would melt at this temperature, but Tungsten is just fine!


Answer 3: The incandescent bulb emits light through black body radiation. This is the process by which every object with heat is constant emitting electromagnetic radiation. The wavelength of the radiation that is emitted depends on the temperature of the object. All electromagnetic radiation has a wavelength, long wavelengths from 100 meters to 1 millimeter comprise radio waves, going to smaller wavelengths from roughly 100micrometer to 750 nanometers is what we call infrared radiation, and 750nm (red) to 400nm (blue/violet) is visible light.


At even smaller wavelengths there is ultraviolet, x-rays, and gamma rays. You probably know that an infrared camera can see a person in complete darkness because people give off infrared radiation, because we are at a temperature of about 37 degrees celsius. At higher temperatures the wavelengths emitted are shorter. In order to emit light that we can see, i. e. 750nm to 400nm,the filament of the bulb needs to be at a temperature of about 3000degrees celsius, which is incredibly hot. Nichrome would melt at this temperature, but Tungsten is just fine!

  • Autor: Roto2
  • Comments: 0
  • Views: 0