1.
Echoes maybe heard more than once due to

2.
SONAR is the abbreviation of

3.
Old people can not hear sounds even above

4.
Sound waves are

5.
The intensity level of the rustling of leaves is

6.
To communicate with each other, Elephants use

7.
The technique or method to absorb undesirable sounds by soft and porous surface is called

8.
A normal human ear can hear a sound only if its frequency lies between

9.
The speed of sound in air is

10.
The speed of sound can be found by relation

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