Ionisation in the thermosphere can change between day and night because it is related to what?
Answer and explanation
Correct answer: Availability of solar radiation
The governing concept is solar ionisation. During daylight, ultraviolet and other energetic solar radiation interact with atmospheric particles and remove electrons, producing more ions and free electrons. At night, this source is greatly reduced, so recombination lowers ionisation. Therefore, option A is correct. Ocean salinity, groundwater level and river gradient have no direct role in the day–night ionisation cycle of the thermosphere.
Frequently asked questions
What is the correct answer to this question?
Availability of solar radiation
Why is this the correct answer?
The governing concept is solar ionisation. During daylight, ultraviolet and other energetic solar radiation interact with atmospheric particles and remove electrons, producing more ions and free electrons. At night, this source is greatly reduced, so recombination lowers ionisation. Therefore, option A is correct. Ocean salinity, groundwater level and river gradient have no direct role in the day–night ionisation cycle of the thermosphere.
Which subject and chapter does this question cover?
This is a Class 11 Accountancy question. Chapter: Bills of Exchange. Topic: Introduction and Concepts.
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