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.
- AStatement-1 is true, Statement-2 is true; Statement-2 is the correct explanation of Statement-1.
- BStatement-1 is true, Statement-2 is true; Statement-2 is not the correct explanation of Statement-1.
- CStatement-1 is false, Statement-2 is true.
- DStatement-1 is true, Statement-2 is false.
Solution & Step-by-step Explanation
Sky wave communication relies on reflection from the ionosphere. Since the density and height of the ionospheric layers vary with time (day/night) and season, the propagation characteristics are unstable compared to ground waves. Thus, Statement 2 explains the instability mentioned in Statement 1.