With the help of a diagram show how longitudinal waves, like sound waves travel in air.
When an object vibrates (makes sound); in this case tuning fork, then the air layers around it also starts vibrating in exactly the same way and carry sound waves consisting of alternate compressions and rarefactions in air from the sound producing object to our ears. When these waves of compression and rarefactions of air fall on our ears, the ear drums vibrate accordingly and reproduce the sound. Thus we could hear the sound produced by tuning fork.
