A) \[\sqrt{5}\times {{10}^{12}}{{m}^{-3}}\]
B) \[\sqrt{2}\times {{10}^{12}}{{m}^{-3}}\]
C) \[2\times {{10}^{12}}{{m}^{-3}}\]
D) \[5\times {{10}^{12}}{{m}^{-3}}\]
E) \[3\times {{10}^{12}}{{m}^{-3}}\]
Correct Answer: C
Solution :
The frequency of electromagnetic waves \[v=9\sqrt{maximum\text{ }electron\text{ }density}\] or \[v=9\sqrt{{{d}_{\max }}}\] or \[9\sqrt{2}\times {{10}^{6}}=9\sqrt{{{d}_{\max }}}\] or \[\sqrt{2}\times {{10}^{6}}=\sqrt{{{d}_{\max }}}\] or \[{{d}_{\max }}=2\times {{10}^{12}}{{m}^{-3}}\]
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