Activity 13.5 Class 8 Science Chapter 13 Solution

Activity 13.5 Class 8 Science Chapter Sound

 In this post, you will find NCERT Science Class 8 Chapter 13 activity 13.5 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 13.4 of chapter 13.

We have already discussed the relation between vibration and sound in the previous activities, and now we will find which part of musical instruments produces sound.

Activity

 

   ·     Take 6-8 bowls or tumblers.

   ·      Fill them with water up to different levels, increasing gradually from one end to the other.

   ·     Now take a pencil and strike the bowls gently.

   ·     Strike all of them in succession.

   ·     You will hear pleasant sounds.

   ·     This is your jaltrang .

 

 Activity 13.5 Class 8 Science Chapter 13 Solution

Observation and Explanation

When we strike the bowls gently, the water in the bowls is disturbed and vibrations are produced. These vibrations travel through water and the surroundings like air to create soothing sounds.

 When the bowl is struck, the water in the bowl produces a low-pitch (low frequency) sound. As the water in the bowl is increased, the frequency or pitch of the sound also increases.

These vibrations in the water produce music.

Note:-  Jaltarang is used as a musical instrument in India since ancient times.

Conclusion

It is concluded that the short air column in the bowl produces high pitch sound.

Related Topics

1. Activity 13.6