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13. Sound
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Q22 of 47 Page 13

What is noise?

The sound which is loud and barsh, which annoys us and reduces our work efficiency is called noise.

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20 Give two applications of ultrasound in medical sciences. 21 Give two applications of ultrasound in industries. 23 What is called musical sound? 24 What do you understand by stringed instruments?
Questions · 47
13. Sound
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