Question

it is a device which is straight and have holes in it which gives us sound​

Answer 1

Answer:It turns out these pieces—also called pinnae or auricula—act like funnels: They collect, amplify and direct sound waves to the ear canal. Pinnae are not randomly created.

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Answer 2

Answer:

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The eight holes of the recorder are comprised of seven finger holes and an additional hole for the thumb of the upper hand. The lower two holes are normally smaller than the rest and positioned side by side so that the player can cover them with a single finger.

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