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CBSE Class 9 Answered

sound through different mediums
Asked by VEDIKA.L | 06 Mar, 2010, 12:16: PM
answered-by-expert Expert Answer

Yes, it's true that sound travels with higher speeds than air in wood or any other solid. But the sound waves don't have higher energy or frequency so as to set up vibrations in wood, since the door is fixed. But when someone knocks on the door, the enough high energy of knocking can set up vibrations which we hear and open the door.

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Answered by | 06 Mar, 2010, 01:31: PM

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