Numerical - Critical frequency for given electron density of F-layer

Q.  If the maximum electron density for F-layer in ionosphere is 4 x 106 electrons/cm3, then what will be the critical frequency of EM wave for F-layer?
- Published on 01 Oct 15

a. 4 MHz
b. 9 MHz
c. 18 MHz
d. 25 MHz

ANSWER: 18 MHz

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