A) \[1.5\times {{10}^{10}}{{m}^{-3}}\]
B) \[1.24\times {{10}^{12}}{{m}^{-3}}\]
C) \[3\times {{10}^{12}}{{m}^{-3}}\]
D) none of these
Correct Answer: B
Solution :
The value of maximum frequency \[f\] which can be reflected from the layer at an angle of incidence \[i\] is given by \[{{f}^{2}}=\frac{80.6N}{{{\cos }^{2}}i}\] where, \[i\] is angle of incidence and N is electron density. For the wave not reflected from ionosphere, \[i=0\] \[\therefore \] \[{{f}^{2}}=\frac{80.6N}{{{\cos }^{2}}{{0}^{o}}}=\frac{80.6N}{1}\] or \[N=\frac{{{f}^{2}}}{80.6}=\frac{{{(10\times {{10}^{6}})}^{2}}}{80.6}\] \[=\frac{100}{80.6}\times {{10}^{12}}\] \[=1.24\times {{10}^{12}}/{{m}^{3}}\]
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