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13. Sound
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Q71 of 123 Page 254

Why should we not put a pin or pencil in our ears?

No, we must never put a pin or pencil in our ears, because it can tear our ear diaphragm.


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70

Why sound cannot travel through vacuum (or through outer space)?

71

What type of pollution is caused by the working of mixer and grinder in the kitchen?

72

Name any two common musical instruments and identify their vibrating parts.

73

What is the difference between noise and music? Can music become noise sometimes?

Questions · 123
13. Sound
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