Page 71 - Science Class 6 Times Publication

3. Ask him whether he could listen the sound or not?

Observation: Your friend can hear the sound produced by the scale.
Here, the sound travelled through the desk (solid medium).

Conclusion: Sound travels through solid.

Sound can travel through liquid

Sound can travel through liquid. Aquatic animals hear the sound
travelled through liquid.

Activity 6.4
To show that sound travels through a liquid

Materials required: Steel plate, bucket, water, etc.
Procedure
1. Take a steel plate and hit the
plate with a metal spoon inside
water. What happens?

Observation: You can hear the sound
of the plate. This shows that the sound
travels through water.

Conclusion: The sound travels through the liquid.

Main Points to Remember

1. Sound is a form of energy which produces the sensation of
hearing.
2. Sound is produced by the vibration of an object.

3. Sound travels from one place to another in the form of wave.
4. Thin and small object produces sharp sound.
5. Larger object produces louder sound.
6. Travelling or movement of sound from one place to another is
called propagation of sound.
7. Sound propagates from one place to another through material
medium.

Times' Crucial Science and Environment 67 Book 6