Exercise, 8th Sci., 15. Sound

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1. If the frequency of a sound wave is changed, a different sound is produced.

2. A region in which air is at low pressure and low density is called ... .

3. The measure of loudness of sound is in ... .

4. Draw fig. of a medium is necessary for propagation of sound

5. The number of cycles that are produced in the air (or other medium) per second is called the ... of the sound wave.

6. Vocal cords are ... cm in length in males.

7. If the sound level is around ... decibels, the sound can be harmful to us.

8. How is sound produced?

9. Sound generation and propagation need a ... .

10. What is the frequency of the vowels "sa" and "ni" in hertz?

11. The frequency is measured in ... .

12. The total number of compressions and rarefactions produced per second in a sound wave is 1000. The frequency of the sound wave is .....

13. The region in which air is at high pressure and high density is called ... .

14. If any object vibrates in the air, due to the formation of compression and rarefaction, ... waves are produced in the air.

15. One compression and one rarefaction together form one ... of the wave.

16. Why the voices of males, females, and children are different.

17. Match the following:

1. Human larynx      Vibrations of metal arms
2. Loudspeaker     Vibrations in air column
3. Jal-tarang     Vibrations in vocal  cords
4. Tuning fork      Vibrations in strings
5. Sitar        Vibrations of screen

18. If sound waves are generated in air, what moves away from the source? Is it the air itself or the state of compression and rarefaction created in the air?

19. In a loudspeaker, ...energy is converted into ...energy.

20. ... can be generated from a vibrating object.

21. The waves used in cell phones do not need any ... for propagation.

22. Suppose the fork vibrates 512 times per second. These vibrations will set 512 cycles of compression and rarefaction in the air per second. Thus, the sound generated by the fork will have a frequency of ... Hz.

23. In the humans, sound is produced in the ... .

24. Vocal cords are about ... cm in females.

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