This question has Statement-1 and Statement-2. Of the four choices given after the statements, choose the one that best describes the two statements.
Statement-1 : Sky wave signals are used for long distance radio communication. These signals are in general, less stable than ground wave signals.
Statement -2 : The state of ionosphere varies from hour to hour, day to day and season to season.
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Sky waves are radio waves reflected by the ionosphere for long-distance communication. Their stability is indeed lower than ground waves, which follow the Earth's surface and are more stable. Therefore, Statement-1 is true.
The ionosphere's state changes due to solar radiation, varying hourly, daily, and seasonally, which affects sky wave propagation stability. This variation directly explains why sky waves are less stable, making Statement-2 true and the correct explanation for Statement-1.
Final Answer: Statement-1 is true, Statement-2 is true and Statement-2 is the correct explanation of Statement-1.