What are the heart sounds? When and how are these sounds produced?

How is sound produced?

What is are heat sounds ? How are they produced ?

(a) What are heart sounds? How are they produced? (b) What is the aim of wild life conservation?

(i) Describe the structure of spinal cord. (ii) What are heart sounds? How are they produced?

If a flute sounds a note with 450 Hz , what are the frequencies of the second , third , and fourth harmonics of this pitch ? If the clarinet sounds with a same note as 450 Hz , then what are the frequencies of the lowest three harmonics produced ?

What is sound and how is it produced?