How To Produce Sounds?

Which of the following produces sound?

How does a gecko produce sound ?

________ do not produce sound when struck.

How is sound produced? How does its pitch gets affected by the size of object?

(a) How is sound produced? Explain with the help of an example. (b) How does sound from a sound producing body travel through air to reach our ears? Illustrate your answer with the help of a labelled diagram.

A body produces sound only if it is