34) Gas discharge lamps lights up to full brightness after a time delay. Which one of the lamps mentioned below has more time delay when compared to other lamps ?

35) Which one of the lamps mentioned below has more time delay when compared to other lamps ?

36) What is the colour of the light emitted by sodium vapour lamp ?

37) The ignition voltage of sodium lamp varies from

38) In a high pressure mercury vapour lamp the mercury lamp discharges