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Question

It is said that sound travels fastest through solids, but once I told my friend to stand on the other side which was separated by a wall and I stood towards the other side and spoke in my normal tone to the wall. But my friend wasn't able to hear anything. If this is so then the statement sound travels fastest through solids would be wrong?  And if it is not wrong then why wasn't  my friend able to hear me? 


Solution

Sound waves are certainly reflected by a wall, otherwise you wouldn't hear an echo from it, but not all the sound is reflected so some travels into the wall. Whether the sound is scattered and/or absorbed in the wall depends on what the wall is made from. Remember that sound is a mechanical vibration. The sound hitting the wall makes the wall vibrate and the other side of the wall makes the air on the other side vibrate. A good solid wall won't disperse the vibrations too much, so you will get some sound through it. 
But the intensity of sound that you made was so low that it didnt register to your friend standing on the other side. But however low intense the sound may be ..it travels faster in Solids. 

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