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For sky wave propagation of 10 MHz signal. What should be the minimum electron density in the ionosphere

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a

1012/m3

b

106/m3

c

109/m3

d

1014/m3

answer is A.

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Detailed Solution

Given : fC=10 MHz = 107 Hz Use, fC=9N ⇒107=9N ⇒1014=81 N ⇒181×1014=N ⇒N=1.23×1012 ⇒N≃1012

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