A) \[4000\text{ }{AA}\]
B) \[6000\text{ }{AA}\]
C) \[9000\text{ }{AA}\]
D) \[15000\text{ }{AA}\]
Correct Answer: A
Solution :
\[{{\lambda }_{medium}}=\frac{{{\lambda }_{air}}}{\mu }=\frac{6000}{1.5}=4000\ {AA}\]
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