Question

When an air column of length l closed at one end produces its fundamental note, the wavelength is given by

• A. $\lambda =l$
• B. $\lambda =2l$
• C. $\lambda =4l$
• D. $\lambda =3l$

Answer 1

The correct option is C $\lambda =4l$

At a closed end a note is formed and at the open end an antinode is formed.

Distance between note and successive antinode is:

$\frac{\lambda }{4}\Rightarrow \frac{\lambda }{4}=l\therefore \lambda =4l$