Question

why do sodium vapours only form yellow light​

Answer 1

Answer:

Electric current is passed through sodium gas, making it emit light. As a result the valence electron present in sodium atoms become excited and emit light. The wavelength of the emitted light is 590 nanometers, which correspond to yellow light. Sodium Vapor lamps emit yellow light only.

Answer 2

• Electric current is passed through sodium gas, making it emit light. ... As a result the valence electron present in sodium atoms become excited and emit light. The wavelength of the emitted light is 590 nanometers, which correspond to yellow light. Sodium Vapor lamps emit yellow light only.