Activity 12.4 Class 9 Science Chapter 12 Sound

Activity 12.4 Class 9 Science Chapter 12

Activity 12.4 Class 9 Science belongs to Chapter 12 Sound Class 9 Science. You will get a complete solution with an explanation and conclusion. After reading activity 12.4, you will be able to answer the questions based on the activity.

Activity 12.4 Class 9 Science Sound

 

You are suggested to study NCERT activity 12.4 class 9 science chapter 12 Sound explanation with a conclusion so that you can attempt questions based on activity 12.4 class 9 science.

Activity 12.4 Class 9 Science

    ·     Take a slinky. Ask your friend to hold one end. You hold the other end. Now stretch the slinky. Then give it a sharp push towards your friend.

   ·     What do you notice? If you move your hand pushing and pulling the slinky alternatively, what will you observe?

   ·     If you mark a dot on the slinky. You will observe that the dot on the slinky will move back and forth parallel to the direction of the propagation of the disturbance.

      

Observation and explanation of activity 12.4 class 9 science

When the slinky is pulled, it starts to uncoil. When it has been pulled completely, we can see coils in the slinky near the free end go farther from each other and form rarefaction.

When the slinky is pushed, the coil in the slinky near the free end come near and forms compression.

When the slinky is pushed and pulled alternatively, the entire slinky is divided into compression and rarefactions and they form a disturbance.

This disturbance is called a longitudinal wave.

When we mark a dot on the slinky and this dot moves back and forth in the direction parallel to the direction of propagation of disturbance.

Conclusion of activity 12.4 Class 9 Science

This activity shows the propagation of longitudinal waves, sound waves are longitudinal waves.

 Related Topics

1. Activity 12.5

2. Activity 12.3

3. Solutions of chapter 12