Question

It is due to the ________ of the vocal cords that the humans speak.

Answer 1

1. A sound is a form of energy that produces the sensation of hearing.
2. Sound energy is the form of energy that is produced by vibrating bodies.
3. For example; when we speak the vocal cord in our throat vibrates to produce sound.
4. When we beat over the membrane of a drum, it vibrates the membrane of the drum which then produces sound.

Thus, it is due to the vibration of the vocal cords that the humans speak.