Page 139 - Science Class 08

A few examples will clarify the point: Wind Instrument (Sushir Vaadya)
v A n with pieces of solid iron when they These instruments use vibra ng air-columns.
are shaken vigorously. The air is blown into the instrument either from

v Sounds of traffic at a busy crossing. the mouth directly or through reed pipes.
v Scratching of brakes of a road-vehicle. Fingers are used on their holes to create
v A crowd indulging in slogans against a various pitches.
leader or speaker. Some wind instruments are shown in the

MUSICAL SOUNDS pictures given below:
A musical sound is the one that is pleasing to
the ear as it is the result of regular vibra ons.

Here are some examples:
v Sound produced by a tuning fork

v Sound produced by a sitar
Whereas, the sound produced by a tunning
fork is flat music, the sound of a sitar is rich in
tones that join together to produce rich notes.

MUSICAL INSTRUMENTS
Percussion Instruments (Avanaddha Vaadya) :
Musical instruments are used to give notes to
These instruments have taut skin that is struck
voice in order to change it into pleasing music.
to produce musical sound. Hard and so strikes
So, these instruments are essen al for
make the sound loud or so .
producing quality music. Because of their
dis nct vibra ons from one another, musical
instruments fall into four categories.
These categories are as follows:

Stringed Instruments (Tantu Vaadya)
They produce music by virtue of their taut
strings or wires. These strings vibrate, when
Jerk Instruments (Ghana Vaadya)
plucked to give out sweet music. The strings
can also be used to change their pitch. These instruments are simply jerked or struck
Some stringed instruments are shown in the with very careful so parts, not hard strokes.

pictures given below: Bells, jal tarang are two common examples of
such instruments.

Science-8 139