Discussion
A mercury vapour lamp gives __________ colour of light.
Answer: A
A mercury vapour lamp gives a greenish blue light.
The discharge in mercury vapour radiates mainly in a few spectral lines in the blue, green and yellow, with very little red. That makes the light look bluish green and distorts colours, which is why mercury lamps were used for street and factory lighting rather than where colour matters.
Yellow is the colour of the low-pressure sodium vapour lamp, and a neon discharge gives orange-red to pink light. White light needs a full spectrum, as from an incandescent or fluorescent lamp.
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