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Which of the, following vapors/gas will give yellow color in a filament lamp?

  • Sodium vapors/gas will give yellow color in a filament lamp.
  • In a low-pressure sodium-vapor lamp, the light is produced by passing an electric current through the vapor of metallic sodium contained in a bulb.
  • The lamp emits a monochromatic yellow light at a wavelength of approximately 589 nanometers.
  • It is also possible to use a sodium vapor/gas discharge tube in conjunction with a filament lamp to produce a yellow light.
  • When the filament lamp is turned on, it heats up the sodium vapor/gas in the tube, causing it to emit yellow light.