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“When the power of love overcomes the love of power, the world will know peace” – Jimi Hendrix

Sound and Vibrations


 

Sounds that you can hear

 

You live in a world filled with sounds. Following are some of the sounds that we hear in our day to day life.

 

1. Bang of a door2. Beat of a drum

3. Blast of an explosion

4. Bubbling of water

5. Buzz of a bee

6. Buzz of a saw

7. Chime of a clock

8. Chug of an engine

9. Clink of a coin

10. Rattling of dishes

11. Ring of a telephone

12. Rustling of leaves

13. Shuffling of feet

14. Toot of a horn

 

Information from different sounds

 

Different sounds can give us different information.

 

Sound

Information

People whistle or sing They are happy
A baby cries It is frightened, hungry or uncomfortable
People groan They are in pain
Ring of a telephone Someone wants to speak to us
Ring of a doorbell There is a visitor for us
Sirens of fire engines, police cars and ambulances Warn people to get out of the way

 

How are sounds made?

Sounds are made when objects vibrate.

 

What is meant by ‘vibrating’?

Vibrating means moving backwards or forwards.

 

E.g. –

1) If you hold one end of a ruler on the table and twang the other end, you can see or feel the ruler moving backwards and forwards (or vibrating) and hear a sound.

       

2) If you put some small buttons on a table and bang it with your fist, the buttons will jump up and down, because the table vibrates when you bang it. 

 

What makes sound?

Everything that vibrates makes a sound.

 

How can we hear sounds?

When an object vibrates, the vibration makes the air around vibrate. The air vibrations enter your ear which you hear as sound.

 

Can we see the vibrations?

Yes we can, but not always.

 

Are all the objects that make sounds vibrating?

If something is making a sound, some part of it is always vibrating.

 

Human sounds

People make many sounds with their voices.

 

Where does your voice come from?

Your voice comes from your throat.

 

How can you feel your throat vibrating?

Put one hand gently on the front of your throat and hum. You can feel your throat vibrating.

 

How do people make sounds?

This happens under the human respiratory system. Following parts of the human respiratory system are involved with this.

 

1)   Mouth

2)   Throat (including voice box and vocal cords)

3)   Windpipe

4)   Lungs

 

a) There is a voice box inside your throat.

 

b) This voice box includes folds of muscle called vocal cords.

 

c) When you speak or sing air from your lungs pass over your local cords.

 

d) Then the vocal cords vibrate and make sounds.

 

How can people change the sounds they make?

People can make the vocal cords vibrate faster or slower and change the sounds.

 

How can people talk?

People change the position of their mouth and tongue to shape the voice sounds into words, so then they can talk.