A 0.640-m long gas column is open at one end and closed at the other. What is the fundamental resonant frequency of the air column if the speed of sound in the air is 340 m/s?
A)432 Hz
B)198 Hz
C)266 Hz
D)669 Hz
E)133 Hz

Question

Quizplus · Accepted Answer

The fundamental frequency of a closed-open tube is given by $ f = \frac{v}{4L} $, where $ v $ is the speed of sound and $ L $ is the length of the tube. Substituting the given values, $ f = \frac{340}{4 \times 0.640} = 133 $ Hz.

A 0640-M Long Gas Column Is Open at One End and and Closed