Sounds of animals, human voices, noise of horns can be heard in our day-to-day life.

TTo observe those sounds, let's do the following activity.

You may have heard many sounds in the environment. For a better understanding, let’s do the following activity.

Let’s do the following activity to identify how sound is produced.

You may feel a vibration when the bell rings. Let's engage in the following activity to learn some ways in which sound is produced.

You may observe that the pieces of paper are moving here and there. That is because the hide of the drum is vibrated when it is beaten. This movement is called a vibration.

Therefore it is clear that sound is produced by vibrating something. The objects that produce sound are called sources of sound. Animals, various types of objects, musical instruments are examples for sources of sounds.

To produce different types of sounds, let’s do the following activity.

As mentioned above, we can produce sounds even by using simple methods.

Now let's find out how do we hear sounds.

Now, you can understand that when the ears are closed, you can’t hear the sound of the drum. We can hear the sound of the drum only when the sound enters to our ear. Ear is the organ which senses sound. Ear lobes help to direct the sound into the ear.

Some sounds that we hear in the environment are produced naturally.

For example:-

•  Sound of wind 

•  Sound of a waterfall

•  Sound of birds 

•  Barking of a dog

There are artificial sounds that are made by man using equipment. Following are some examples.

•  Sound of a car 

•  Sound of a school bell

•  Sound of an aeroplane 

•  Sound made by a guitar

Sounds that are sung or played rhythmically are known as music.

For example:-

Sound created by violin, sound created by flute

Sounds that are not rhythmic are known as noise.

For example:-

Noise of traffic, noise of machines in a factory, noise in a fair

When the sound of music is increased, it too can be a disturbance.

Let's make some equipment to produce sound.

Given below are some other equipment which produce sound in the same way as the tin guitar you made.

Figure 6.15 shows some other instruments which produce sound in the same way as a flute.

Given below are some instruments that are played as same as a drum.

Listening to loud sounds is a disturbance. Those sounds are also a disturbance to others. We must use television, radio, loud speakers and other equipment without disturbing others.

Exercise

01. Fill in the blanks with the given words.

Sound is produced by .................... of an Object. Objects that

produce sound are known as ............................ . Ear is an organ

which is......................... to sounds. Rhythmic sounds are known as

...................... and unrhythmic sounds are known as ........................

. By hearing .................noises, ................can get affected. It is our

duty to use .................... without disturbing others.

(sources of sound, noises, sensitive, vibration, music, sounds, loud,

ears )

02.If the following sentences are true, put a (✔️) and if wrong put a (❌)

within the brackets.

i. Ear lobes help to direct sounds to the ear. (   )

ii. The sound of a Tabla is produced in the same way as in a violin. (    )

iii.The sound of a flute is produced in the same way as in a trumpet. (     )

iv. Most of the time, rhyhmic sounds are not a disturbance to the ear. (     )

v. It is suitable for people who work in places of loud noises to wear ear

protectors. (    )