6-9: 7 SEE ANSWER

Answer: (example) The feedback system is present in semi-closed systems, such as a clarinet with a reed present. First, the player forces air into the instrument, causing the reed to close. When the air reaches the other end a negative pulse returns which pulls the reed completely closed. Since no air can go through the closed chamber the air is reflected, which causes the reed to open. Following this, the pressure points returns and the air escapes the instrument (producing sound). These steps repeat to form a continuous and smooth tone.

1. REDIRECT 6-9 Assessment