what dominant colour appears for(a)the mecury street bulb (b)the sodium street lamp and (c) an incandescent bulb?

Answer 1

(a) blue-violet, (b) yellow* (c) orange

*High-pressure sodium lamps are pink, and are replacing the low-pressure yellow kind.
http://en.wikipedia.org/wiki/Sodium-vapor_lamp

Answer 2

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Answer 3

Pink