Chapter 13 - Sound - 3


1. Match the column.................................ordinary conversation




2. Match the column.................................rustle of leaves




3. Match the column.................................average whisper




4. Match the column.................................heavy street traffic




5. Match the column.................................intensity




6. Match the column.................................intensity level




7. Match the column.................................speed of sound




8. Match the column.................................wavelength




9. Match the column.................................frequency




10. Vibrating bodies produce_______________.


11. Sound waves are _________waves.


12. A material ______ is necessary for the propagation of sound waves.


13. The places where molecules of the medium are very close to each other are called _________.


14. The snail like part in the structure of inner ear is known as __________.


15. Speed of sound is __________ in solids as compared to that in liquids.


16. Greater the distance from vibrating body, _________ is the loudness.


17. Loudness is directly proportional to __________ of intensity.


18. Intensity level of fainstest audible sound is ______.


19. S-I unit of intensity of sound is ___________.


20. Intensity level of ordinary conversation is _________.


21. The places where molecules of the medium are very far from each other are called _________.


22. The voice of ladies and children is shrill and of high _______.


23. The sounds which have pleasing effect on our ears are called ___________ sound.


24. Bacteria in liquids can be destroged using high intensity _____________ waves.


25. If area of vibrating body is larger than the sound produced is __________.


26. Old people can not hear sounds even above ________ Hz frequency.


27. In laboratory, a U shaped device used for producing a particular sound is known as _______.


28. Sound which has a jarring effect on our ears is called _______.


29. The depth of an ocean is measured by using ____________.





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