Sound

Sound Worksheet-7

61. Do you see the vibrations in all the cases?

62. Explain the principle on which Jal Tarang works.

63. Name the organ in human that produces sound. How does it work?

64. What do you mean by vacuum? What happens to the loudness of sound in vacuum?

65. How do human hear the sounds?

66. What do you mean by oscillatory motion?

Sound Worksheet-8

1. Sound cannot travel in vacuum.

2. The number of oscillations per second of a vibrating object is called its time period.

3. If the amplitude of vibration is large, sound is feeble.

4. For human ears, the audible range is 20 Hz to 20,000 Hz.

5. The lower the frequency of vibration, the higher is the pitch.

6. Unwanted or unpleasant sound is termed as music.

Sound Worksheet-9

1. ______ is the to and fro motion of an object.

2. ____ is produced by vibrating body.

3. The vocal cords in man are about ____mm long.

4. The unit of frequency is ____.

5. The maximum displacement of the sound vibration is the measure of ____ of vibration.

6.  _____ Oscillations per second.

7. ____ is the duration of time for one oscillation to occur.