NIOS Class 10 Science Activity 18.1 Solution |Sound and Communication Explained

In this activity, we learn how sound is produced due to vibrations through a simple experiment.

Sound and Communication Activity Solution

This activity is based on the NIOS Class 10 science and technology (212) Chapter 18- Sound and Communication Module 4- Energy

Aim

 To show that sound is produced due to the vibration of objects

Materials Required

    1. Aluminium wire or metallic hanger

    2. Rubber band or elastic string

    3. Thread

    4. Small paper strip

    5. Guitar, sitar, or ektara

    6. Tabla, drum, or steel tumbler

Procedure

 We take an aluminium wire or a metallic hanger and bend it into the shape of a bow. Then we tie a rubber band or elastic string tightly between the two ends of the bow so that it remains stretched.

Now we pluck the string and listen to the sound. Then we touch the vibrating string and notice the change.

Now we take a small paper strip and fold it into a V-shape and place it on the string. After that, we pluck the string and observe the paper strip.

We also pluck the strings of a guitar or sitar and notice what happens. We can also sprinkle some powder on the surface of the tabla or drum and strike it.

Observation

    1. When we pluck the string, it starts vibrating and produces sound.

    2. The paper strip placed on the string moves up and down.

   3. The powder on the tabla moves due to vibrations.

   4.  When we touch any vibrating object or surface, the sound stops.

Explanation

When we pluck or strike an object, it starts vibrating rapidly. The air particles around the object start vibrating due to these vibrations. The vibrating air particles carry the energy of vibration from one particle to another and reach our ears in the form of sound waves. So, we hear sound.

When we touch or hold the object, these vibrations stop, and the sound disappears.

 So sound is produced by vibrations.

Conclusion

We can conclude that sound is produced by vibrating objects, and no sound is produced when vibrations stop.

Frequently Asked Questions

   1. What happens when we pluck the string?

Answer – When we pluck the string, it starts vibrating and produces sound.

   2. What happens when we touch the vibrating string?

Answer – The vibrations stop, and the sound also stops.

   3. What conclusion do we draw from this activity?

Answer – The sound is produced by vibrations.