Question

In radio-communication, the signals emitted by transmitting antenna are reflected on; 1) stratosphere; 2) ozonosphere; 3) ionosphere; 4) troposphere

Answer 1

3) ionosphere

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In radio-communication, the signals emitted by transmitting antenna are reflected on ionosphere

Answer 2

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In radio-communication, the signals emitted by transmitting antenna are reflected on 3) ionosphere