A) incandescent electric lamp
B) mercury vapour lamp
C) sodium vapour lamp
D) polyatomic substances
Correct Answer: A
Solution :
Incandescent electric lamp produces continuous emission spectrum whereas mercury and sodium vapour give line emission spectrum. Polyatomic substances such as \[{{H}_{2}},C{{O}_{2}}\]and \[KMn{{O}_{4}}\] produces band absorption spectrum.
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