If a sound wave goes from a cold air region to a hot air region, its wavelength will?
increase
decrease
decrease then increase
remain constant
Explanation
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velocity is directly proportional to the root of temperature, and also proportional to the wavelength
so wavelength is directly proportional to the temperature
that means if the temperature increases, the wavelength will also increase
QED
The speed of sound in air increases with temperature.
From v = f x wavelength
Jst know that f is constant from one region to another.
Therefore as V is increasing wavelength will also INCREASE.
Option A 
also the movement of sound in air is directly proportional to the square root of it's temptation. that means as temperature increases the sound increases and it's movement or sound it produces changes from one medium to another of different densities. example the Velocity of sound in liquid is much higher than it's velocity in air and greatest in solid .
