An airplane flying with a constant speed flies from a warm air mass into a cold air mass.The Mach number will
A)increase.
B)decrease.
C)stay the same.
D)become unstable.

Question

Quizplus · Accepted Answer

The Mach number, which is the ratio of the speed of the airplane to the speed of sound in the surrounding air, will increase when the airplane flies from a warm air mass into a cold air mass. This is because the speed of sound decreases in colder air, assuming the airplane's speed remains constant.

An Airplane Flying with a Constant Speed Flies from a Warm