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In short wave communication waves of whi...

In short wave communication waves of which of the following frequeuncies will be reflected back by the ionospheric layer having electron density `10^(11)per m^(3)`?

A

2 MHz

B

10 MHz

C

12 MHz

D

18 MHz

Text Solution

Verified by Experts

The correct Answer is:
A
`N_(max)=(f_(c)^(2))/(81)=((10xx10^(6))^(2))/(81)~~1.2xx10^(12)m^(-3)`
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