For takeoff and landings of aeroplanes, airports at high altitudes …..
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a
have longer runways than do airports at sea level.
b
have same length of runways as do airports at sea level.
c
have shorter runways than do airports at sea level.
d
May have runways shorter than do airports at sea level.
answer is A.
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Detailed Solution
Lift on airport wings is proportional to ρv2 where ρ = Density of air and v = speed. At high altitude ρ is less, hence v be more. Hence, longer runways are required.