How Does Sound Board Work?

Last week 3rd graders  learned about sound board with a fun and engaging experiment called "chicken in a cup". The vibrations from the string would be almost silent without the cup. When you use the cup, it spreads the vibrations and amplifies them. Pianos and music boxes use wood to act as a sounding board to make the instrument louder. 

For more information about sound boards, please see the video on the following website :http://www.sciencebob.com/experiments/videos/video-chicken_cup.php