Why does lack of water vapour promote a high daily temperature range in dry regions?
Answer and explanation
Correct answer: Because low water vapour traps less longwave heat at night
The governing concept is the greenhouse effect of water vapour. During the day, a dry surface can heat rapidly, while at night the lack of water vapour allows more outgoing longwave radiation to escape directly to space. Consequently, daytime temperatures become high and night temperatures fall sharply, producing a large daily range. Option A is correct; the other options confuse atmospheric gases or sunlight with humidity.
Frequently asked questions
What is the correct answer to this question?
Because low water vapour traps less longwave heat at night
Why is this the correct answer?
The governing concept is the greenhouse effect of water vapour. During the day, a dry surface can heat rapidly, while at night the lack of water vapour allows more outgoing longwave radiation to escape directly to space. Consequently, daytime temperatures become high and night temperatures fall sharply, producing a large daily range. Option A is correct; the other options confuse atmospheric gases or sunlight with humidity.
Which subject and chapter does this question cover?
This is a Class 11 Accountancy question. Chapter: Theory Base of Accounting. Topic: accounting principles.
