Sound Worksheet-9

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.

8. Objects that produce sound are called _____ of sound.

9. The organ involved in the production of sound in human is _____.

10. ____ are the thin membranes stretched across the voice box

11. Sound travels in the form of a ____.

12. Shrillness or pitch is determined by_____ of the vibrating object.

13. Pitch is directly proportional to _____.

14. Loudness is directly proportional to _____.

15. Higher the frequency of the vibrating body, the higher is the ____.

16. The part of the outer ear which is visible is called____.

17. _____part of ear collects sound waves and directs them to ear tube.

18. Middle ear is a cavity with ____ ear bones.

19. Sound waves travel fastest in _____ and slowest in _____.

20. Human ear cannot hear sound waves of frequency below____.

Answer:

1. vibration/oscillatory motion

2. sound

3. 20

4. Hertz

5. amplitude

6. one

7. time period

8. sources

9. larynx/voice box

10. vocal cords

11. wave

12. frequency

13. frequency

14. amplitude

15. shrillness

16. pinna

17. pinna/external ear

18. three

19. solid, gases

20. 20 hertz