Activity 13.6 Class 8 Science Chapter 13 Solution

Activity 13.6 Class 8 Science Chapter Sound

 In this post, you will find NCERT Science Class 8 Chapter 13 activity 13.6 and after reading this, you can understand the meaning of sound, characteristics of sound, propagation of sound, properties of sound, and types of sound waves. You should also go through activity 13.5 of chapter 13.

Activity

    ·     Take two rubber strips of the same size.

    ·      Place these two pieces one above the other and stretch them tight.

   ·     Now blow air through the gap between them.

   ·      As the air blows through the stretched rubber strips, a sound is produced.

   ·     You can also take a piece of paper with a narrow slit and hold it between your fingers as shown in Fig.

   ·     Now blow through the slit and listen to the sound.

   ·     Our vocal cords produce sound in a similar manner.

·     

Observation and Explanation

When rubber strips are stretched tightly and the air is blown through the gap, the rubber strips begin to vibrate and produce sound.

Similarly, in humans, the sound is produced by the voice box or the larynx. Two vocal cords are stretched across the voice box and there is a slit between two cords. When air passes through the slit, vocal cords start vibrating.

Conclusion

This activity shows that vibrating parts produce sound.

Related Topics

1. Activity 13.5

2. Activity 13.7