The lowest tone to resonate in pipe of length L that is open at both ends is 200 Hz. Which one of the following frequencies will not resonate in the same pipe?
A) 800 Hz
B) 400 Hz
C) 600 Hz
D) 900 Hz
E) 200 Hz

Question

Quizplus · Accepted Answer

A pipe open at both ends resonates at frequencies that are multiples of the fundamental frequency. The fundamental frequency here is 200 Hz, so it will resonate at 200 Hz, 400 Hz (2x200 Hz), 600 Hz (3x200 Hz), and 800 Hz (4x200 Hz). 900 Hz is not a multiple of 200 Hz, so it will not resonate in the pipe.

The Lowest Tone to Resonate in Pipe of Length L