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CBSE XII
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Physics
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Communication systems
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Q)
What is the value of frequency at which an e.m wave must be propagated for the D- region to have a refractive index of
0.49
Electron density for D- layer is
10
9
m
−
3
3.27
×
10
5
H
z
327
×
10
5
H
z
32.7
×
10
5
H
z
0.327
×
10
5
H
z
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