Q86 / 120 · VITEEE 2014 · Physics

Beyond which frequency, the ionosphere bands any incident electromagnetic radiation but do not reflect it back towards the earth?

A
$50 \mathrm{MHz}$
Correct answer
B
$40 \mathrm{MHz}$
C
$30 \mathrm{MHz}$
D
$20 \mathrm{MHz}$

Solution

The ionosphere can reflect electromagnetic waves of frequency less than $40 \mathrm{MHz}$ but not of frequency more than $40 \mathrm{MHz}$.

Hence, the correct answer is option: 'B'.

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