1.

In short wave communication, waves of which of the following frequencies will be reflected back by the ionospheric layer having electron density 10^(11)m^(-3)

Answer»

2 MHz
10 MHz
12 MHz
18 MHz

Solution :Critical frequency.`f_(c)=9(N_(MAX)^(1//2))`
=`9(10^(11))^(1//2)=2.8xx10^(6)Hz`=2.8MHz
The wave of frequency 2 MHz will be reflected by the IONOSPHERE.


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