Question

Can you produce sound without utilising your energy?

NCERT Class IX
Sciences - Main Course Book

Chapter 12. Sound

Answer 1

No ,  you cannot produce sound without utilizing one's energy.   

Sound requires energy to propagate.   When an object vibrates, then sound waves are produced.   When we speak, the voice comes from the vibrations of vocal cords / folds / muscles.  In order that the muscles compress/expand, vibrate, move,  energy is required.

So we cannot speak without utilizing energy.

Answer 2

Answer:

Sound requires energy to propagate. When an object vibrates, then sound waves are produced. In order to vibrate energy is required.

Thus, we cannot produce sound without utilizing energy.

Explanation: