A) 13
B) 14
C) 15
D) 16
Correct Answer: C
Solution :
No. of spectral lines observed. \[=\sum \left( {{n}_{2}}-{{n}_{1}} \right)\] \[=\sum \left( 7-2 \right)=\sum 5=5+4+3+2+1=15\]You need to login to perform this action.
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