JEE Main 2011 Physics question
Not in JEE or NEET syllabus
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.
Answer: (1)
Solution
Sky waves reach long distances by reflection from the ionosphere; because the ionosphere's state keeps changing with time of day and season,
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