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Question:

what types of surfaces can help create the greatest echo.?

for example im doing a science fair project and the expirement involves a surface of a book a plate and and the materials that complete the experiment are a loud clicking clock and two paper towl tubes and the sound should go through the tube and bounce off the book (plate) and go through the second tube.

Answer:

Smooth surfaces reflect sound better than rough surfaces. To show this, replace the book with felt or cotton balls.
Hard flat smooth surfaces like marble walls.

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