This questions has Statement-1 and Statement-2. Of the four choice 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.
Correct Option: , 2
Solution is not requried