A 20 cm long organ pipe is filled with air and is open at one end and closed at the other. The speed of sound in air at 0°C is 331 m/s. What is the wavelength of the fundamental mode?
A) 40 cm
B) 60 cm
C) 80 cm
D) 43 cm
E) 75 cm

Question

Quizplus · Accepted Answer

In a pipe open at one end and closed at the other, the fundamental mode has a wavelength four times the length of the pipe. Therefore, the wavelength is 4 * 20 cm = 80 cm.

A 20 Cm Long Organ Pipe Is Filled with Air