Sound refraction in air with different temperature layers (from warm to cold).
However, the direction in which the sound spreads also changes as the speed changes. It is said that the sound wave is “broken”. In the case described, i.e. when sound moves from a warm to a cold layer of air, the sound wave is broken upwards.
Information and ideas:
How does sound behave when it moves from a colder to a warmer layer?
Is it correct that you hear worse against the wind than with the wind?
The latter can be checked together with students in an experiment.
A comparison with the refraction of light rays can be made.
Relevant for teaching:
Vibrations and waves