What is the temperature around an aeroplane flying at an altitude of 4000 metres if...

WAEC 2023

What is the temperature around an aeroplane flying at an altitude of 4000 metres if the temperature on the earth surface is 40 oC?

A. 26 oC
B. 66 oC
C. 14 oC
D. 12 oC

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Explanation

Initial temperature = 40oC
Final temperature = ?
According to lapse rate
1000m ascent = 6.5oC decrease in temp.
4000m =x
4000 = 6.5 x 4=26.0oC
Final temp. = (40o -26o)C=14oC

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What is the temperature around an aeroplane flying at an altitude of 4000 metres if...

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