If the maximum electron density for E layer in ionosphere is 9 × 106 electrons/cm3, then its critical frequency is

If the maximum electron density for E layer in ionosphere is 9 × 106

1.	If the maximum electron density for E layer in ionosphere is 9 × 106 electrons/cm3, then its critical frequency is
A.	81 MHz
B.	9 MHz
C.	27 MHz
D.	54 MHz
Answer» D. 54 MHz

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If the maximum electron density for E layer in ionosphere is 9 × 106 electrons/cm3, then its critical frequency is

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