A sodium vapour lamp consists of an inner bulb of special glass contai – McqOptions

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1.	A sodium vapour lamp consists of an inner bulb of special glass containing the sodium and inert gas at a pressure of ________ Hg.
A.	1.5 mm
B.	1.8 mm
C.	2.5 mm
D.	3.5 mm
Answer» B. 1.8 mm

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