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When a sodium vapor lamp is switched on, initially the color is?

  • When a sodium vapor lamp is switched on, initially the color is Pink.
  • A sodium vapor lamp can emit a pink color for a short period of time before it stabilizes to its normal yellow-orange color.
  • This initial pink color is caused by a small amount of neon gas that is added to the sodium vapor inside the lamp.
  • When the lamp is first turned on, the neon gas emits a pinkish-red light as it becomes ionized.
  • After a few minutes, the neon gas is fully ionized and the sodium vapor reaches its normal operating temperature, causing the lamp to emit its characteristic yellow-orange light.