Snake produces hissing sound through

When a when powdered solid is dropped in water, it produces a hissing sound. What the solid may be ?

A little amount of water was sprinkled on a small lump of a white substance A. A lot of heat was produced with a hissing sound. The substance A got changed into an amorphous powdery mass B . Identify A and B. Also, write the chemical equation involved.

Heterodon flattens its head, produces frequent hissing and strikes to advertise as if it is dangerous. This is an example of:

Answer the following : How does sound from a sound producing body travel through air to reach our ears?

(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.