Master the Skies in 2025: Ace Your ATPL - SARON & SAMRA Practice Test!

The speed of sound in a medium, such as air, is indeed directly proportional to the square root of the absolute temperature measured in Kelvin. As the temperature increases, the molecules in the medium move faster, which allows sound waves to travel more quickly. This relationship can be derived from the formula for the speed of sound, which is influenced by the temperature of the air.

In practical terms, as you raise the temperature of the air, you increase the kinetic energy of the air molecules. This increased energy allows sound waves to propagate more rapidly through the medium. This is why it is accurate to describe the relationship between the speed of sound and temperature as directly proportional, as an increase in temperature results in a proportional increase in the speed of sound.

The other options do not accurately describe the nature of this relationship. For example, an inverse relationship would suggest that as one variable increases, the other decreases, which does not hold true for sound speed and temperature. Similarly, while one might think of exponential or linear relationships in other contexts, they do not accurately represent the mathematical interaction between the temperature and sound speed in this case.