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In short wave communication waves of whi...

In short wave communication waves of which of the following frequencies will be reflected back by the ionospheric layer, having electron density `10^(12) 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
`f_(c) = 9 sqrtN`
`9 sqrt(10^(11))`
` = 2 xx 10^(6) Hz`
= 2 MHz
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