Sound

Sound Worksheet-13

31. Which Characteristic of a vibrating body determines

(a) loudness

(b) Pitch of the sound produced by it.

32. Why do we hear the thunder a little after we see the flash of lightning?

33. Why do we not hear echoes in our ordinary surroundings?

34. We cannot hear the sound of the exploding meteors in the sky, though we can see then, Why?

35. We can hear the supersonic jet planes flying. How?

Sound Worksheet-14

1. A vibration is rapid back and forth movement.

2. Sound can travel through liquids and gases but not through solids.

3. Sound waves propagate through movement of molecules from one place to another.

4. The ear drum transmits the sound to the middle ear.

5. The speed of the sound depends upon temperature.

6. We cannot hear sound waves of frequency below 20 Hz.