Question

The air temperature is 24C and an air column carries a standing sound wave at a frequency of 350Hz. What is the length of the air column, which is closed at one end, if you want to hear the third harmonic ? 

Answer 1

Answer

For third harmonic length of air column can be written as

$l=\frac{3v_s}{4f}=\frac{3\times331}{4\times350}=0.8m$