Question

Does any part of our body vibrate when we speak? Name the
part.


NCERT Class VIII
Science - Exemplar Problems

Chapter 13. Sound

Answer 1

-->Human beings produce sound by using the voice box which is called as Larynx.
-->It is situated at the top of the wind pipe(trachea).
--->The Larynx contains two ligaments known as Vocal cords.
---->Sound is produced by the vibration of these vocal cords.
---> when we speak, the muscle of vocal cords contract due to which two vocal cords, become stretched and close together leaving only a narrow slit between them,
---> The lungs, pass a  current of air between the two vocal cords, this air makes the vocal cords vibrate and vibrating vocal cord produces sound.

Hence , when we speak, vibrating vocal cord produces sound.

Answer 2

sound is produced by humans by the voice box or the larynx in humans. two vocal cords are stretched across the voice box. when lungs force air , vocal cords vibrate to produce sound.

thus, our vocal cords vibrate when we speak

hope it helps you ...

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