Which of the following is true about Ionosphere?
Correct answer: B. Its density is greater at short distances from tplanetary surface in daytime and decreases as ionosphere rises at night-time, thereby allowing a greater range of radio frequencies to travel greater distances
- A. Its density is lesser at short distances from planetary surface in morning and further decreases as ionosphere rises at night-time, thereby allowing a greater range of radio frequencies to travel greater distances
- B. Its density is greater at short distances from tplanetary surface in daytime and decreases as ionosphere rises at night-time, thereby allowing a greater range of radio frequencies to travel greater distances
- C. Its density is greater at long distances from planetary surface in daytime and further increases as ionosphere rises at night-time, thereby allowing a greater range of radio frequencies to travel greater distances
- D. None of the above
Explanation
The ionosphere is denser in its lower regions during daytime because solar radiation produces more ions, while reduced ionisation at night changes its height and radio-reflection behaviour. This simplified description matches option b; the actual ionosphere varies across several layers and frequencies.
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