What is the temperature around an aeroplane flying at an altitude of 4000metres if the temperature on the earth's surface is $40ºc$ ?

$14^0C$

$66^0C$

$26^0C$

(\12^0C\)

Correct answer is A

Lapse rate is simply described as 0.65°C per 100m of ascent or 6.5ºC per 1000m of ascent. Therefore 4000m of ascent= 6.5ºC x 4000m/1000m=26.0ºC Then, the temperature around the aeroplane is = 40ºC - 26ºC = 14°C

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