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A girl and a boy are playing along the railing. If the girl taps loudly on the metal railing, how many sounds will the boy who has his ear to the railing hear, and why?

Answer :

The boy will hear two sounds. He will hear the sound of a girl tapping on the railing and he will also hear the sound of the vibrations traveling through the railing to his ear. Since sound waves travel through solids, the vibrations from the tapping will travel through the railing and be transmitted to his ear, creating a seond sound.

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