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You and some friends decide to do an experiment. You purchase 3 identical sound generators. One is placed inside the water at one end of a 10 m pool, the second is placed at one end of a 10 m block of wood, and the third is placed on a table. Friend A kneels at the other end of the pool with her ear in the water. Friend B stands at the other end of the block of the wood, with his ear pressed to it. Friend C stands 10 m away from the table, with only air between herself and the sound generator. The sound generators go off at the same time. Which friend hears the sound first?: A. Friend A B. Friend B C. Friend C D. They all hear the sound at the same time.

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1. You and some friends decide to do an experiment. You purchase 3 identical sound generators. One is placed inside the water at one end of a 10 m pool, the second is placed at one end of a 10 m block of wood, and the third is placed on a table. Friend A kneels at the other end of the pool with her ear in the water. Friend B stands at the other end of the block of the wood, with his ear pressed to it. Friend C stands 10 m away from the table, with only air between herself and the sound generator. The sound generators go off at the same time. Which friend hears the sound first?: A. Friend A B. Friend B C. Friend C D. They all hear the sound at the same time.





 
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