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What is sound?...

What is sound?

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“The sound was familiar one.” What sound did the doctor hear? What did he think it was? How many times did he hear it? (Find the places in the text.) When and why did the sounds stop?

The sound level of a dog's bark is 50 dB . The intensity of a rock concert is 10,000 times that of dog's bark. What is the sound level of the rock concert?

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