Question

A closed organ pipe (closed at one end) is excited to support the third overtone. It is found that air in the pipe has:

• A. Three nodes and three antinodes
• B. Three nodes and four antinodes
• C. Four nodes and three antinodes
• D. Four nodes and four antinodes

Hint:

In a closed organ pipe, the number of nodes and antinodes increases with the overtone number. For the third overtone (fourth harmonic), the pipe supports four nodes and four antinodes.