Page 90 - Genius Kidz Prudence Learning Sc-8

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Flute
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Sonophone
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Cymbols

SOUND PRODUCED BY US Phonation : The process of sound production

Human beings produce sound with the help of by quasi-periodic vibrations of the vocal cord
larynx or Adam's apple or voice box. or larynx or voice box is called as phonation.
Voice box is present in the anterior neck and Larynx box consists of two vocal cord tissues.
remains connected at one end to the pharynx When we speak, the vocal cord tissues are
and at the other end to the trachea or wind pulled and thus a gap is created between

pipe. them. As a result of this air passes through the
space created into a windpipe. When air
Larynx can manipulate the pitch and volume of
passes through the gap in between vocal cord
sound produced.
tissues, it causes them to vibrate and vibrating
vocal cords produce sound.
MEDIUM FOR SOUND PROPAGATION

(a) Sound propagation through air : Sound
that we hear travels through air. In general,
Larynx we can say that air is the medium for
propagation of sound. Speed of sound in air
is about 340 m/sec.

(b) Sound propagation through liquid : Sound
Trachea
(windpipe) travels much more faster in liquids than in
air. One of the very simple activities that
suggest that sound can travel in liquid is

swimming under water. When we breathe
Sound producing organs

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